Master Chief Petty Officer Jason Hayes, Bravo 1
Bravo Team leader, who takes operational command when he and his men are out in the field.
- Character Tic: Briefly in "Tip of the Spear" where his hand rubs his legs. This is most likely from wiping Nate's blood from his combat pants.
- Dented Iron: Jason freely admits that age and injuries are catching up to him and makes sure to receive physical therapy so that he can continue going out into the field.
- Experienced Protagonist: In Season 2 he says he's been a SEAL for 20 years and spent half of that time leading Bravo. Season 3 clarifies it more accurately as 18 years when Mandy says he's been in this fight from the beginning (i.e. since 9/11).
- Hopeless with Tech: Alana notes that although millions of dollars went into training and equipping him, Jason can't figure out how to use a pod coffee machine.
- My God, What Have I Done?: Jason feels guilty for calling out Lopez and goading him into following the raid on Gonzales, because his identity was exposed during that mission, leading to the entire Lopez family being marked for death.
- My Greatest Failure: He blames himself for the events that led to Nate's death due to his insistence in searching a cargo ship suspected to be used by terrorists.
- Omniglot: Speaks Arabic and English.
- O.O.C. Is Serious Business: Since he normally wears t-shirts and shorts around base, DEVGRU's CO can immediately see that something is wrong when Jason comes to his office in proper uniform.
- Master Chief Rock: The rock that holds up his team.
Senior Chief Petty Officer Ray Perry, Bravo 2
Long-time SEAL veteran and Hayes' friend ever since they became SEALs.
- All for Nothing: All the agonizing over whether to tell the Army investigator about the truth of his grenade throw turns out to be this when he makes a full disclosure of what really happened with his injured shoulder. The investigator (who at this point has already decided to clear Ray of any wrongdoing and recommends a paltry $5,000 reimbursement to the victim's family) barely even reacts to the confession and doesn't change a thing in his report. Even worse, it's pretty clear from his demeanor that he doesn't really care about Ray's emotional state and that he viewed the whole investigation as just an annoying formality.
- Crisis of Faith: Ray struggles with his belief system and purpose for much of the latter part of season 2, after denying a dying man last rites in an attempt to elicit information from him. He ultimately finds his way back to his faith after getting separated from his team and nearly dying in "My Life for Yours."
- Friendly Sniper: He is one of Bravo's snipers, sharing the role with Clay.
- Happily Married: One of the few SEALs with a happy home life with his wife and two children.
- Keeping Secrets Sucks: He lies to Jason about the state of his shoulder so that he can go on deployment with the rest of the team and continue getting paid at combat pay rates. It ends up biting him big time when during the chase against Abu Ali, he tries to throw a frag grenade to flush him out of cover but his shoulder acts up and it ends up short. It then turns out his grenade killed a 10-year old Afghan boy and he finds himself the subject of an Army investigation. When he finally comes clean to Jason in the first season finale, Jason is furious at him.
- The Lancer: Supportive 2nd in command and confidant to Jason, who also doesn't hesitate to call him out and (try) to keep him grounded.
- Morton's Fork: In "Containment," he experiences severe pain in his shoulder during an informal physical. Jason takes him off the mission and orders him to get a full medical examination including an MRI, a process which will take weeks. This puts him in a tough spot since his home finances are a disaster as the budget he had built with his wife depends on him bringing in hazard pay from combat missions, which will be ruined if he can't go on missions. He decides not to see any doctors and ends up lying to Jason after the team comes back from the mission to Moldova that his arm is just slightly strained and the doc prescribed him some painkillers.
- In "Ignore and Override," Blackburn informs him that he's up for a promotion to Master Chief, which would be a massive boon for his family's financial situation. But taking the promotion would require him to leave Bravo Team since the Navy looks down on any SEAL team having two Master Chiefs in the same unit. In "Adapt and Overcome" he decides to solve the problem by instead going for a promotion to the Warrant Officer track instead, which will allow him to stay on the team while still bringing in the extra income his family needs.
- Omniglot: Speaks Arabic and English.
- Real Men Love Jesus: A devout Christian with a very good memory for the Bible, who never misses church.
- Reassigned to Antarctica: Played with. Ray certainly considers being taken out of the field and being put in charge of training a Green Team to be this. But Adam explains just how important it is for more experienced operators to pass on their knowledge and Jason previously pointed out that taking a training assignment is a necessary step in becoming a team leader even as he was kicking Ray out of Bravo as punishment.
- Two First Names: "Ray" and "Perry."
- Verbal Tic: Makes a very regular habit of calling his fellow SEALs "brother."
SWO1 Sonny Quinn, Bravo 3
A heavy weapons specialist who frequently acts as the team's devil's advocate.
- Butt-Monkey: He bears the brunt of his fellows' ribbing, from them implying he's not smart enough to read, to being ribbed over his fear of sharks.
- The Cynic: He's very honest when he says that the team can't expect to save the Syrian refugees in "Other Lives", considering what's happening in Europe with the refugee crisis and the Syrian Civil War.
- Forbidden Romance: He and Davis begin a relationship towards the end of Season 2. While it was already iffy to begin with (since they work closely together), it crosses into forbidden territory once Davis earns her commission.
- Married to the Job: He's the one member of the team who has absolutely zero social life that isn't related to the military in one way or another. Starts changing in season 2 when he eventually starts a relationship with Lisa Davis.
- More Dakka: He's in charge of handling light machine guns during a combat op.
- The Nicknamer: In Season 2, he starts giving Clay new nicknames every episode, trying to find one that will stick. He later starts doing the same to Kairos.
- Sad Clown: The first season finale reveals that he actually has a very sad and lonely life outside of DEVGRU, with an empty apartment and no non-military friends or family.
- Why Did It Have to Be Snakes?: He has an ever increasing list of phobias related to every environment SEALs operate in. Everyone finds it especially ironically hilarious that Sonny joined the Navy and became a SEAL despite being afraid of the water and sharks.
SWO2 Clay Spenser, Bravo 6
The newest member of Jason's team. He's questioned by commanders and veterans alike for not obeying orders and taking things seriously.
- Badass in Distress: In "The Upside Down," the explosion from an Iraqi artillery shell causes him to fall down a hole into a cellar. Ray has to leave him behind so he can set up an overwatch position to cover the rest of the team, leaving Clay on his own to avoid detection by ISIS fighters.
- Dare to Be Badass: In "Payback," when Lisa comes by to visit him in the hospital, he doesn't want to talk about his feelings so he coaxes her to talk instead. She ends up admitting that she may not be cut out for Officer Candidate School and may drop out. Clay's immediately lashes out at her for giving up on a long-time dream of hers, and pointedly reminds her that "the Navy needs all the good ones," giving her the inspirational boost to stay in the OCS program. This is the first time since being admitted to the hospital that he was able to focus on something other his own doubt and self-pity.
- Embarrassing Nickname: In Season 2, Sonny starts heaping nicknames - such as "Blondie", "GQ", and "Cover Girl" - on Clay to see if one sticks.
- Foil: Clay's this to Jason, just because he's in a relationship with Stella and is concerned on having a committed relationship. Jason warns him that depending on how things are with her, he may or may not have a good marriage.
- Friendly Sniper: He shares this role with Ray, providing overwatch for Bravo in the field.
- Heroic BSoD: In "Say Again Your Last," shortly after taking a 7.62 round to the body armor, Clay watches Adam Seaver, Bravo's temporary team leader who's also his mentor, die in an explosion. As 2IC, Clay is supposed to take over command, but he completely shuts down to the point of being unable to even respond to Blackburn on the radio. Ray ends up stepping up to take over for the rest of the mission, for which Clay later thanks him.
- It Runs in the Family: His father served with the SEALs and DEVGRU; Jason describes him as being "special ops royalty."
- New Meat: He's already an experienced SEAL Team 3 operator and was an assistant team leader before trying out for DEVGRU. This means nothing to the veterans in the team he's trying to join and he's treated like a green recruit and, when sent out in the field, is regarded as a "strap" note rather than an operator. When he finally passes Selection, he's relentlessly hazed and soon finds himself owing the team 19 cases of beer for various "infractions".
- Omniglot: He's spoken at least seven different languages/dialects on screen so far. He grew up in Africa and speaks several local dialects. He also demonstrates the ability to speak at least some Pashto, French, Hindi, Spanish and Mandarin.
- Raised by Grandparents: He was raised by his maternal grandparents, as neither of his parents were capable of taking care of him.
- Sins of Our Fathers: His father wrote a tell-all book about the Navy SEALs and was declared persona non grata by his former comrades. As a result, Clay finds that his trainers are prejudiced against him.
- Small Name, Big Ego: He thinks he deserves the spot he's trying out for. Everyone else thinks otherwise. Much of his Character Development in Season 1 is learning to grow out of this.
- Trauma Conga Line: This trope probably applies to all members of Bravo to some extent due to the nature of their job, but may apply to Clay a little extra. In roughly a year's worth of time within the show, he has:
- Watched his best friend die in a training accident
- Gotten shot, then immediately afterward watched his mentor die in an explosion, for which he blamed himself
- Been left by the girlfriend he loved and wanted to marry, because she couldn't handle her own fear of losing him in action
- Been critically wounded by an IED, sustaining injuries that threaten his career
- Found his friend, the only person he had to help him through recovery, dead of a self-inflicted gunshot wound
- What the Hell, Hero?: He is frequently on the receiving end of lectures because of his flippant conduct.
- When the capture op on an ISIS leader goes bad, Hayes calls him out for shooting him since he told to cover them instead of clearing the tunnel, and the mission was to capture the target alive.
- During training, Big Chief calls him out for not keeping an eye on the hostage, because she turned out to be a terrorist.
- Adam reams him out for grandstanding during training by heroically Jumping on a Grenade, saying that glory-seeking has no place within the teams and will only get people killed during real missions.
- In "Backwards in High Heels", both Lisa and Sonny berate him for going after someone Stella meets up in a bar despite she and Clay calling off their relationship mutually.
SWO1 Trent Sawyer, Bravo 4.
Bravo's corpsman. He also occasionally acts as a designated marksman alongside Ray and Clay.
- Ascended Extra: He starts getting more lines and focus in the second season, particularly after Clay is crippled by an IED in the Philippines and is airlifted back to America for treatment.
- Badass Driver: Uses his driving skills in "Collapse" to help Hayes and the others get to the American Embassy in downtown Juba.
- Combat Medic: He is the team's corpsman, rendering first aid in the field to whoever needs it.
- Friendly Sniper: Sometimes takes on the designated marksman role, using a longer-barrelled HK416D and appropriate optics instead of his usual 10-inch barrel carbine with holographic sight when he's needed to support Clay.
- Stuff Blowing Up: Trent is more than happy to use a LAW to take out an ISIL armored vehicle borne IED during an op in Syria.
- Those Two Guys: With Brock.
SWO1 Brock Reynolds, Bravo 5
Bravo's canine handler who is also tasked with backup activities, such as tracking down missing persons.
Lt. Commander Eric Blackburn
A DEVGRU squadron commander and Jason's immediate superior.
- Artistic License Military: At one point Blackburn is addressed as "Lieutenant" even though he is a Lieutenant Commander and should be addressed as "Commander".
- Mildly Military: Due to the nature of special operations, Bravo addresses him by name rather than by rank or as "Sir". He only starts insisting on formalities when Bravo truly screws up.
- Mission Control: His responsibilities require him to stay behind and take overall responsibility of missions and act as a liaison between his team and higher command authorities back in the States. Even when he goes out in the field with the team, he'll hang back and provide overall command while Jason handles the actual tactical decisions.
- Mr. Exposition: Leads the briefing back in America for the SEALs.
- Non-Action Guy: He rarely goes into the field since he needs to have an overall view of Bravo's missions. His gear is never too far away, though, if he needs it.
- Reasonable Authority Figure: He'd like to help his men on the ground by accommodating their requests. Sometimes, the bureaucrats don't always agree with him.
An intelligence analyst who provides the team with intelligence prior to being deployed, being a liaison from the CIA.
- Aloof Dark-Haired Girl: She's very guarded and professional.
- Being Personal Isn't Professional: Mandy is friendly/respectful to the SEALs, but avoids spending time with them off hours or getting too friendly. She explains to Lisa that her job is to send people into dangerous situations where they can be killed, and keeping her distance is required for her to do her job.
- Mr. Exposition: Responsible for briefing the SEALs prior to an operation.
- Omniglot: Speaks English and Tagalog, the latter with an accent.
- Reality Ensues: In order to get an the Indians to provide a helicopter that extracts Bravo team from hostile territory after they save Ray, she gives the Indians the name and location of a terrorist that happens to also be a CIA asset. When the team returns, she goes before a CIA board and gets called out for going rogue. As a result, and despite her role in saving a SEAL team, she gets herself assigned to desk duty in DC instead of the field.
- Two First Names: "Mandy" and "Ellis".
- Voice with an Internet Connection: Helps relays intel to the SEALs.
Ensign Lisa Davis
A member of the support staff who helps Mandy and the rest in providing information to Hayes and the others. She later earns a commission after graduating from Officer Candidate School.
- Action Girl: In "Collapse" where she helps Ray evacuate a wounded reporter from Juba.
- Almighty Janitor: Davis is "only" a logistics specialist who manages Bravo's logistics, but she keeps the Bravo Team show running behind the scenes, and as Blackburn puts it, she has a group of the most aggressive, independent alpha males in the world eating out of her hand. Brock meekly accepts her chastisement when one of Cerberus' cases goes missing (because he didn't pack it according to her system).
- The Chains of Commanding: She begins feeling the weight of these when she begins running operations as an officer. Now that she is in a position to make life-and-death decisions about Bravo, she feels the pressure a lot more.
- Ensign Newbie: Becomes this after she earns a commission. Although everyone is well-aware of her abilities and respect her, they can't resist engaging in some light-hearted ribbing.
- Insecure Love Interest: During the deployment to Afghanistan, she confides in Clay that she is a bit worried that her boyfriend Danny is spending so much time with his physical therapist, who is in her mind "a six-foot blonde."
- Rank Up: She graduates from OCS in Season 2 and is commissioned as an ensign.
- Secret Keeper: Defied on her behalf. She reveals in "Enemy of my Enemy" that she could see on the drone footage that Ray's injured shoulder affected how he threw his grenade and that she would be willing to delete the footage. Ray threatens to have her reported to the Criminal Investigation Division if she does so.
- Two First Names: "Lisa" and "Davis".
- Up Through the Ranks: After nine years as an enlisted sailor, she decides to apply to OCS to become an officer.
- Voice with an Internet Connection: Helps relays orders and advice to the SEALs.
EOD Summer Kairos, Bravo 7
An Explosive Ordinance Disposal Technician who joins Bravo in Season 2.
- Chuck Cunningham Syndrome: He disappears without a trace halfway through Season 2.
- The Gadfly: He intentionally needles Sonny, partly because it's fun and partly because Jason ordered him to.
- Granola Guy: He plays up his laid-back California hippie vibe because it annoys Sonny so much.
- Sitcom Arch-Nemesis: He and Sonny instantly clash, playing up the tribal differences between California and Texas, to the amusement of the rest of Bravo, although the clash is mostly one-sided and kept alive by Sonny.
- Weapon of Choice: He carries an MP7 as opposed to the HK416s the rest of Bravo normally carries.
Scott Carter, Alpha 1
Jason and Alana's son.
- Morality Pet: For Jason to at least come home and see him once in a while.
- Tyke Bomb: Gets into trouble with the school's principal due to an altercation after his parents separate.
Jason and Alana's oldest child and the big sister of Michael.
- Morality Pet: With Michael for Jason and Alana.
- But Not Too Foreign: Story material from CBS mentions that she's Kurdish, but raised entirely in America.
- Happily Married: With Ray and they're expecting their second child.
- Meet Cute: She was working as an ER nurse in Detroit when Ray was brought in after a bar fight and bled out over her new white shoes.
- Rant-Inducing Slight: She cancelled their premium cable TV package, as Ray finds out when he tries to watch football on his favorite cable channel. When he demands to know why she did so without telling him, she tries to say she's just cutting back on some extra expenses, but when he keeps pressing, she ends up letting loose on him about how bad their financial situation is and just how little he knows about it due to him always being on deployment.
- What the Hell, Hero?: Naima gets more angry at Ray in the middle of Season 2 for not helping her keep house and putting things in priority for their daughter ever since he got back from Mexico.
Clay's girlfriend, a graduate student.
- Demoted to Extra: After she breaks up with Clay in the second season, her appearances on the show become much sparser.
- Never Heard That One Before: When Clay first meets Stella, he says "SSTTTEEELLLAAA!". She's not amused and asks if he can even name what the quote is from, or quote something else form it. As she's leaving, he does in fact use a different quote from it, getting a genuine chuckle out of her.
- Only One Name: Her last name was only mentioned once, very briefly near the end of the first season finale when another teacher's aide refers to her as "Ms. Baxter."
- Soapbox Sadie: A very left-wing self-proclaimed feminist who studies education and gender studies. She starts to lay off on the politicking the longer she's with Clay, especially after they move in together into an apartment complex specifically reserved for SEALs and she gets to know the couple across the hall who are also a SEAL and his girlfriend.
A retired SEAL commando who is now a book writer and frequent commentator on cable news networks. He wasn't present in Clay's life due to his time with the SEALs.
- Disappeared Dad: Unfortunately had this role due to the need of being ready to be deployed 24/7. Clay hated this.
- Glory Hound: Clay more or less accuses him of this in "My Life For Yours," but also notes that it can be used for good, such as using his major media influence to further promote himself by tackling the problem of traumatic brain injuries in the military.
- Persona Non Grata: He wrote his book without permission from the Navy, leading him to be ostracized by his former comrades.
- When You Coming Home, Dad?: His constant deployments led to him becoming a stranger to his own son.
A SEAL veteran who helps oversee the SEAL's training.
- Awesome Mccool Name: He's addressed as "Big Chief" as he's the most senior Chief Petty Officer within the team.
A WMD specialist who's called in whenever the SEALs get involved in scenarios that have WMDs. He's called "Dr. Death" by the SEALs.
- Mr. Exposition: Gives Jason the briefing that the drill bit he found was drilling Lanthanum in "Takedown".
- Non-Action Guy: He's forced to join the SEALs in the field to test for chemical weapons during the Syrian op and is not happy about it.
Dr. Julie Kruger
The team's appointed psychologist who looks after their welfare by conducting psychological evaluations.
- Reasonable Authority Figure: Dr. Kruger wants to help Hayes get over what happened to Nate, but she tells him that he needs to stop blaming himself for Nate's death.
Lieutenant Abu Nadi
- Authority Equals Asskicking: Leads the Afghan Army Special Forces contingent to work alongside the SEALs in Afghanistan.
- Red Herring: Asadi's suspected of being a mole for Hakan since he just transferred to join up with his Special Forces from his assignment in the Afghan Army Commando unit. Turns out that it's one of Nadi's trusted men who's the mole for Hakan and not Asadi.
Colonel Francisco Martinez
- Colonel Badass: Colonel Martinez accompanies Bravo on their raid on Gonzalez at the start of the Mexico arc, and regularly personally leads his Marines on raids against the cartel.
- Elites Are More Glamorous: Leads a Marine Naval Infantry unit assigned to bag Doza.
- Face Death with Dignity: Takes a bullet in an ambush and loses a fatal amount of blood. Martinez calmly requests that he be given Last Rites, and quietly, calmly, goes to meet his maker.
- Heroic Sacrifice: Hides his bullet wound from Bravo Team, to make sure that Trent will use his limited medical supplies to save Lazo, so that Lazo can lead them to Doza, knowing full well that his wound will be fatal without medical attention.
- Hero of Another Story: Has led anti-cartel operations with Mexican Marines in the past, and has been enough of a nuisance to be marked for death.
Lieutenant Juan Lopez
- Chekhov's Gun: Tells a story on how he knows of a Mexican soldier who sacrified himself to a cartel to save his family from being targeted. It worked and the cartel paid no attention to his relatives, but it's implied that they have PTSD due to the soldier's death. Turns out that Lopez wanted to do the same thing until Jason and Ray saved him from being stupid.
- Elites Are More Glamorous: Assigned to a Marine Naval Infantry unit assigned to bag Doza.
- Fire-Forged Friends: Butts heads with Jason early on, but grows into mutual respect and friendship after they operate together.
- Hot-Blooded: Is rearing to go into action in order to end the mess Doza started, but his superior and the SEALs always have to rein him in.
- Hero of Another Story: Participated in numerous anti-cartel operations in the past.
Sergeant Major Nigel Wickham
- Elites Are More Glamorous: An NCO from the British SAS.
- Nice Guy: Despite Jason talking down his initial plans for being too risky, Nigel's willing to listen to him for any suggestions.
Commander Johnny Bayani
- Elites Are More Glamorous: He serves with NAVSOG, which was partially modeled after the SEALs.
- Meaningful Name: His surname, Bayani, means hero in English. He's in the NAVSOG taking out the NRF.
Agent Rita Alfaro
No.2 man of the Halani Network, working under his brother Nouri Halani.
- Dragon Ascendant: Offers up Nouri Halani to the Americans, so that they'll take him out and weaken his faction, allowing Abad to usurp control of the Halani Network.
General Selim Hakan
Afgan National Police commander for Nangahar Province, as well as a successful businessman and fixer who plays all sides against each other.
- Asshole Victim: He's targeted by the Halani Network just to clean up potential loose ends.
- Dirty Cop: Widely suspected internationally of being involved secretly in the drug trade.
- The Mole: For the Halani Network.
- Walking Spoiler: It'd be hard to talk more about the man especially if he gets killed later on.
- Villain with Good Publicity: He's a well-known officer in the Afghan National Police.
- Private Military Contractor: Heads Xenon Tactical Security and its Afghan operations.
- Villain with Good Publicity: He's a well-known PMC commander, whose company has a reputation for being more ethical than Blackwater.
- Arc Villain: Of the Mexico arc in season 2.
- Expy: The SEALs treat him on the level of ISIL since he doesn't discriminate killing men, women and children.
- Although the use of his drug money to provide services in the rural parts of Mexico has him on part with Pablo Escobar.
- Even Evil Has Standards: According to Doza, he doesn't threaten people to work for him. He gives them choices and makes them choose the less evil one.
- Villain with Good Publicity: He's well-liked by the public for providing public services. Not to mention that the rest of the world unsuspectingly knows Doza as a businessman.
- Would Hit a Girl: Doza doesn't spare his female employees if they do something stupid. He even kills his sister-in-law.
- Cop Killer: Responsible for killing a DEA officer operating in Mexico City.
- The Dragon: To Doza and he leads up interrogations on anyone trying to make a move on the Doza Cartel alongside El Lazo.
A SEAL and good friends with Jason. His death in "Tip of the Spear" serves as the catalyst for the stateside storyline.
- Plot-Triggering Death:
- His death shocked Jason so much that it negatively affected his personal life, resulting in his wife kicking him out of the house and his trying to salvage his marriage or, failing that, at least trying to stay close to his children.
- An ongoing plot involves Jason and Ray investigate allegations that Nate was seeing someone else after Alana finds Nate's burner phone. It's resolved in "The Spinning Wheel" when one of Jason's ex-buddies back in Afghanistan helped the woman escape after she got paranoid about her husband's disappearance, who worked as an interpreter, for fear of being assassinated by the Taliban. Nate helped her stateside with setting up her new name and identity.
A SEAL who's training with Clay to be in a Tier-1 team. He is killed during a parachute freefall qualification test when his parachute doesn't open on time.
- We Hardly Knew Ye: Not a lot is revealed about him while he's alive, aside from the fact that he's the one person who doesn't dismiss Clay out of hand. After his death, however, Clay and Adam slowly piece together that Brian came from a broken home and had a rough childhood but that he refused to succumb to his troubled surroundings and eventually found a place to belong in the Navy and the SEALs.
Jason's estranged wife. They were separated a few weeks after Nate dies in the line of duty.
Alana died after her vehicle got into a collision with a drunk driver.
- Amicable Exes: Despite their separation, they still try to get along in part because of Michael's future of potentially growing up without his parents in his life.
- Make Up or Break Up: She gives Jason her ultimatum in "Getaway Day" that she cannot keep sharing Jason's life with the Navy and decides to divorce him.
- Pull the Thread: Discovers a burner phone among Nate's remaining belongings and insists that Jason look into it.
- Sex with the Ex: "Ghosts of Christmas Future" shows she and Jason are still sleeping with each other despite their separation. She knows it's not a healthy arrangement.
Master Chief Petty Officer Adam Seaver
A senior instructor in Green Team, responsible for training and selecting potential DEVGRU operators.
In Season 2, he steps in as Bravo 1 to take Jason's place in the wake of Alana's death. He dies stopping a suicide bomber during an attack in Mumbai.
- Brutal Honesty: He doesn't hold back when it comes to verbally criticizing his recruits, frequently targeting Clay for his grandstanding during training. Jason says that this is actually a sign that Adam is getting soft in his old age as, in the past, he'd normally beat recruits to a pulp for insubordination.
- Drill Sergeant Nasty: Downplayed; Adam is more strict and demanding than he is mean.
- Heroic Sacrifice: He tackles a suicide bomber and is killed when the bomb vest goes off.
- Retired Badass: Used to be Bravo 1, some years before the start of the series, but has since become a training instructor in Green Team.
A retired SEAL who served with Bravo Team. He becomes a roommate of Clay's after Stella moves out.
- Driven to Suicide: After being denied treatment at the VA, he winds up shooting himself in the heart in his truck rather than spend another decade slowly going insane and dying an equally horrific death.
- Game-Breaking Injury: He had to retire from the military after a long combat career. Unfortunately he found out years later that all those years of taking explosions up close have caused a traumatic brain injury that is destroying his mental faculties, and he has no treatment options since it was not reported at the time of his discharge.
- Hero of Another Story: His exploits with Bravo Team before he was discharged on medical grounds.
- Hope Spot: It looks like his luck is turning around when he & Clay are able to bully a VA bureaucrat into fast-tracking him into an appointment with a doctor, until said doctor admits he can't order any serious medical treatment for him due to the clerical issues of his discharge.
- My Greatest Failure: In what would be his final mission, he made a bad call that got one of his teammates killed, a fact that haunts him to the end of his days.
- Nice Guy: While Clay was recovering from the bombing attack, Brett come to see him everyday.
- Video Will: In "Rock Bottom" Clay finds a recording he made right before committing suicide asking that his brain be studied for future research into TBIs in hopes that the knowledge may benefit other servicemen, which is why he shot himself in the heart instead of the head.
DEVGRU's commanding officer at the beginning of the series.
- Put on a Bus: He hands over command of DEVGRU off-screen in Season 3.
- Reasonable Authority Figure
- He is fully understanding of Ray's dissatisfaction of being a Green Team instructor but gently suggests that Ray consider how gunning for an open team leader position might look to Jason and the rest of Bravo.
- He later supports Jason's decision to step down as an operator to spend more time with his children and tries to talk Jason through the emptiness he will feel once he stops operating.
- After Brett Swann's death, Clay threatens to take the story to the media in hopes of getting Swann awarded a Purple Heart, and Harrington orders him not to. When Clay responds by simply getting his father to go to the media instead, Harrington gives his approval and says he hopes the strategy works.