Ray: Yeah, well, I'm pretty sure our hosts don't want us flashing Old Glory across the city, right?
There may be a time when the hero or the villain needs to do something covertly to the point that if they were seen, their identities can be given away due to publicly known or identifiable police (or law enforcement agencies), military or paramilitary uniforms, insignias, logos, name or ID tags. That's certainly going to be troublesome if someone was able to detect them and "inform" the relevant personalities. If that's done, their efforts are doomed to fail no matter what they do.
So what can be done? One way is to temporarily dispose/hide anything that can be identified by the public by hiding their uniforms, insignias, logos and IDs until it's safe to use them again. Sometimes, they also accompany the use of balaclavas and face masks. Others include the use of technology such as hacking or creating false identities in order to hide their actual names and affiliations from the public eye. Dressing as the Enemy is also another way of temporarily hiding your face and identity until the time is right. Another is to simply change clothes before the operation is performed until it's over. Or you can just insist that you're not a cop/soldier/law enforcer/etc.
One of the few negative ideas about it is that it can sometimes lead to a Friend or Foe scenario. Others bad scenarios include catching your allies unaware of who you are or miscommunication when the persons or groups involved are not identified correctly by friendlies. Sometimes, the undercover cop/agent/soldier/etc. can be forced into a situation where they need to do something horrible to prove that they're really a criminal/terrorist.
Partially Truth in Television since a False Flag Operation always requires a group to hide anything that can easily identify them if an operation is conducted. Anyone doing an legitimate undercover op needs to pull this off successfully so that they can't be easily unmasked.
Compare/contrast to Secret Identity, which entails to hiding your identity fully from the public. Compare to The Mole, which is one reason why the people involved would hide their true allegiance alongside The Infiltration, which is another reason why people would go to great length to hide their allegiance as a mole.
Any Rogue Agent will probably want to do this to keep attention away from them if they're acting as the bad guy, which in this place with be a subversion of said trope.
- In Darker Than Black, this is used by the Public Security Bureau's 4th Foreign Affairs Division whenever they get a case, criminal or terrorist alike, that relates to Contractors. Saito goes undercover as a waiter from a catering company when he infiltrates the hotel owned by the Qing Long Tang triad in order to find out who was responsible for assassinating its prominent members. Averted in the sense that he used his official name instead of an alias. Misaki calls him out on this.
- Heavy Object has the Information Alliance military operate a commando unit led by Wyndine Uptown. Uptown orders the commandos to dress up as maids and publicly tell the rest of the world that they're a private military contractor with a maid appeal in order to hide their activities.
- The Indexverse (A Certain Magical Index, A Certain Scientific Railgun and A Certain Scientific Accelerator) has Judgement, a law enforcement agency next to Anti-Skill, which is made up of young people ranging from elementary school to university/college students. They wear the green arm band to signify their status as Judgement officers. But if he/she needs to proceed with an investigation without revealing their status, they have the right to take it off and hide it to avoid being discovered.
- The Ghost in the Shell franchise has Public Security Section 9, a secretive law enforcement unit that "officially" doesn't exist in the Japanese law enforcement system. The government gets to use them in sensitive missions that requires their intervention before a case gets to the public eye.
- Section 9 is not the only plainclothes unit to not be easily recognized. In Stand Alone Complex, the Narcotics Suppression Squad operates as a plainclothes unit, which allows the Big Bad in the first season to use their assets to take out S9. When that fails, the Japanese Maritime Self-Defense Forces' Umibozu is called in to use its commandos in order to flush out S9 and take them all alive or kill them since they are known as a black ops in the JMSDF.
- One of the new elite police-soldiers in Jin-Roh: The Wolf Brigade is Kazuki Fuse, and he scores well enough in exercises that his superiors choose him to go undercover to locate the renegade band called the Wolf Brigade. Fuse agrees, and begins making contact through the sister of a known anarchist sympathizer, Kei Amemiya. Imagine their surprise when the police honchos discover that Fuse has been part of the Wolf Brigade all along, assigned to infiltrate the police corps.
- ANBU in Naruto are special black ops-esque teams that every big ninja village has. They are instructed not to carry any identifying mark of their villages, including their signature headbands with the village logo carved on them.
- Night Raid 1931 has the Sakurai Kikan, an Imperial Japanese Army intelligence unit sent to Shanghai after World War I to operate there. Since they operate in civilian clothes, speak other languages aside from Japanese and Shanghai was considered to be a multinational city since other foreign nationalities were present at the time, it was easy for the SK to work there.
- This is the main operational method of COSMOS (Children of Soldier Machine Organic System) and the Machiner's Platoon as part of the American military in Spriggan. Since they operate as black ops-type military units and are issued with a variety of small arms and equipment, they can plausibly deny their involvement in an operation in case it goes bad.
- In Clear and Present Danger, the members of the black ops team inserted into the Colombian jungle must leave their dog tags in the helicopter before they jump out and start their mission.
- Force 10 from Navarone. During World War II, Force Ten meets up with some Yugoslavian partisans friendly to the Allies, who take Force Ten to their village. Once there the partisans reveal that they are actually Nazi-allied Chetniks by revealing their Chetnik badges.
- Shiri has the 8th Special Forces unit going rogue from the Korean People's Army. As such, they blend in by being identical to South Koreans and pretending to be South Korean SWAT officers and soldiers in order to fufill their terror plot. Which is Truth in Television as part of North Korean special forces doctrine.
- In George Mc Donald Fraser's Flashman series, the titular coward is faced with implacable native assassins trying to hunt him down. He reasons that the last place they will look is among native soldiers in the Indian army. So ~Flashman grows his beard long, exploits his native-fluency in Urdu and Pashtu, and signs up, masquerading as an ordinary native cavalryman. Later, he is able to justify this as he is there on Intelligence duties assessing the likelihood of native mutiny and has realized the only way a white Englishman can accurately understand what is going on, is to get to the natives on their level.
- In Gate, JGSDF soldier Private Hitoshi Furuta masquerades as a chef after an assassination attempt was made at the JGSDF's Alnus base.
- In Magicians of Gor Tarl and his friend Marcus get jobs as auxiliary guardsmen, which gives them license to freely roam the city armed, while also going around instigating civil unrest as the "Delta Brigade" (named after a failed military campaign in a delta). Occasionally they take off their guardsman armbands, create some mayhem as the Brigade, and then reattach the armbands in order to "investigate" their own crime.
- Joker Game has the D Agency solely to conduct black operations for domestic and foreign operations if needed to protect Japanese interests and conduct counterespionage operations against foreign spies and other hostile organizations. The spies are recruited from the civilian populace and are trained for various types of operations, including deep cover assignment.
- In Bernard Cornwell's Starbuck series about the American Civil War, the titular Major Starbuck exposes corruption in the base depot by posing as a notoriously drunken junior officer who nobody takes seriously. He exposes his real identity and higher rank when he is sure, and has proof that, supplies and rifles meant for the front are being sold for profit on the black market.
- Blindspot has Orion, a black ops Navy SEAL team that's responsible for attacks done all over the world and their attacks are blamed on other individuals and organizations.
- The plot of Crisis (2017) is that the Public Security Mobile Investigation Unit Special Investigation Team is a covert plainclothes unit, being used to go undercover and head sensitive operations when required by the National Police Agency.
- Dark Blue has a secretive LAPD unit that has its officers go undercover as criminals and other types of undesirables that the risk is great, especially if the problem has the officer settling on their new identity. Said unit is not officially recognized as a unit in the force, so there's the problem of having a budget publicly set aside for them. Being in the unit can also make you use the same methods the bad guys use to put them away and can wreck your family and social life outside the force.
- In the episode "Wesenrein" in Grimm, the team moves to save Monroe from being killed by a cult known as the Wesenrein. Since they are going in without official police backup, Nick, Hank and Sean toss their police badges in the unmarked SUV in order to hide any details that can give their identity away as police officers. Averted with Wu, who simply didn't bother to conceal his uniform or minimize it so that the cultists can't identify him as a police officer.
Wu: "Just so you know, I left my badge at home."
- This time, it's fully played in "Cry Havoc" when Wu had the foresight to leave his PPB badge at his house to avoid being called out as a police officer against the Verrat.
- In the Law & Order: Special Victims Unit episode "Demons", Stabler goes undercover as a paroled sex offender in order to track another parolee whom he suspects of having already reoffended. Part of his undercover work involves letting his fellow detectives hassle him so that he can report to them without the parolee getting suspicious.
- A subplot in the 4th season of NCIS involves Tony going undercover to flush out arms dealer Rene Benoit as part of an operation sanctioned by Director Jenny Shepard to find evidence on whether Benoit had a hand in killing her father.
- Throughout NCIS: Los Angeles, this is how agents and support personnel of the Office of Special Project operate. They are a NCIS-sanctioned deep cover anti-criminal/terrorist unit.
- A subplot of 19-2 involves officers of the 19-2 precinct going all out to hunt down a suspect responsible for beating up one of their own in a trap. Since they cannot hunt down and apprehend the suspect because the investigation and arrest of said suspect is conducted by another department, they decide to wait until they are off-duty and are not needed in the precinct by changing out of the uniforms and wearing civilian clothes so that the suspect won't be able to call them out as police officers.
- In an episode of NYPD Blue when Medavoy and others go undercover for a prostitution sting, after Medavoy brings his prostitute back to his motel room the prostitute asks if he's a cop. Rather than say yes or no, Medavoy deflects the question; and then moments later when she has definitely proposed exchanging sex for money he arrests her.
- Throughout the fourth season of Person of Interest, John Reese falls to this when he needs to help Finch and others conduct operations against Samaritan agents and/or to save civilians in trouble by hiding his NYPD badge from plain sight when he has to, wear a balaclava and use his own sidearm instead of the department-issued sidearm. It also helps that Reese has a false identity made by The Machine to hide him from Samaritan. Fusco falls into this also when he wears a balaclava and hides his badge to help Team Machine.
- HR officers operate like this by wearing civilian clothes with balaclavas and use non-department weapons and gear if the situation calls for it.
- In SEAL Team, especially the episode "Hold What you Got", the Mexican Marines working with the SEALs are in charge of an op to bag a cartel leader in Mexico. Because of the serious sensitivity of the operation and not to mention of the possibility that the cartel may have sympathizers in the military, police and intelligence services assigned to work with them, Jason and the rest of Bravo Team have to visually masquerade as Mexican Marines and use their gear in order to blend in since their American camos/patches can easily give them away.
- In the second season of True Detective, Ani, Velcoro and Woodrugh operate in this ways months after the shootout in downtown Vinci by secret orders of State Attorney Katherine Davis after she found some implications one of her fellow attorneys may be in on the take with the local criminal underworld. This meant that they needed to operate without any official backing from the Attorney General's office by being "Special Investigators", which meant that they cannot be named in anyway. It helps that Ani joined in after she got suspended from detective duties in the Ventura County Sheriff's Office, Velcoro was now doing private security duties with Frank and Woodrugh was moved from highway patrol to insurance fraud in the California Highway Patrol due to the scandal with actress Lacey Lindel, which allows him to move around freely without being hounded by the media easily. It also helps that they operate in civilian clothes, which avoid any problems in easily being identified as police officers.
- Federal agent Vinnie Terranova from Wiseguy willingly gets sent to prison for eighteen months to establish his cover as a street thug. This move results in his recruitment into Sonny Steelgrave's organization, where he rises to become The Dragon to Sonny. However, his cred as a mafia thug causes his father to disown Sonny, and breaks his mother's heart.
- This is how Camp X-trained agents operate in occupied Europe throughout X Company. They have to use fake IDs and names in order to avoid the risk of being caught by the Wehrmacht or by their collaborators.
- Stormbringer supplement Stormbringer Companion, adventure "Hall of Risk". One of the possible starts is "On Orders from the Queen", in which Queen Yishana of Jharkor asks for volunteers from her military to investigate the title Hall in the nation of Shazaar. She tells them that the job is "unofficial" and orders them to remove all Jharkor insignia and colors from their armor and shields and deny being from Jharkor if anyone in Shazaar asks them.
- Happens on a semi-regular basis in BattleTech. One of the most famous instances was during the 4th Succession War, when the ComGuard, Comstar's top secret military branch note , staged an attack on the New Avalon Institute of Science in an attempt to destroy the military research that was being conducted there while disguised as a mercenary unit.
- A feature with all police/intelligence agencies when they need to send in officers/agents undercover. This is done by creating false names and backgrounds and use their informants to "vouch" for them while they conduct their assignment to infiltrate the criminal underworld.
- In the military, special forces only do not wear insignias from their units (Sometimes, but it depends on the unit and/or their commanding officer/s), but they are also trained to handle other small arms and wear clothing other than what their military issues to them so that the hostile nation/organization does not trace anything back to them if the operation goes bad.
- There's an urban legend that suggests that someone suspected of being an undercover officer should be asked of their true status. This allegation is proven false since undercover officers do not have to do this while performing their work.