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We travel light, we probe deep, and we strike hard. We're Delta Green, and we may be outlaws and cowboys and fools, but we've kept this green ball of shit safe and sound for longer than most people have been alive.
— Reginald Fairfield
Choose federal law enforcement. Choose the military. Choose NASA or the CDC. Choose lying to your superiors. Choose to ruin your career. Choose no friends. Choose divorce. Choose life through the bottom of a bottle. Choose destroying evidence and executing innocent people because they know too fucking much. Choose black fatigues and matching gas masks. Choose an MP5 stolen from the CIA loaded with glasers, with a wide range of fucking attachments. Choose blazing away at mind numbing, sanity crushing things from beyond the stars, wondering whether you'd be better off stuffing the barrel in your own mouth. Choose The King In Yellow and waking up wondering who you are. Choose a 9mm retirement plan. Choose going out with a bang at the end of it all, PGP encrypting your last message down a securely laid cable as an NRO Delta wetworks squad busts through your door. Choose one last Night at the Opera. Choose Delta Green.
An acclaimed sourcebook for the famous Call of Cthulhu tabletop roleplaying game, Delta Green tells the story of the eponymous organization, a secret United States agency born of the Federal raid on Innsmouth, Massachusetts in 1929 and tasked to protect the country from paranormal threats. After an operation gone horribly wrong in Cambodia in the '60s, Delta Green was officially shut down - but its leaders, aware of the things lurking in the cracks of reality, continued the fight illegally, stealing resources from the government, carefully picking new members from the federal agents community, and generally acting like rightfully pissed off Cowboy Cops in their battle against the supernatural. It would not be until the 1994 assassination of Major General Reginald Fairfield, Delta Green's de facto leader, than DG would take up their current incarnation: a deeply hidden conspiracy in the labyrinthine world of the United States federal agencies, structured in semi-independent cells.Delta Green is heavily based on classical conspiracy/UFO theories, meshing them with the Cthulhu Mythos milieu: DG themselves are a spin on The Men in Black, but there are also other shadow agencies involved, including the now famous Majestic 12 group that deals with the Greys (actually Mi-Go in disguise). Other players are the Karotechia, occultist Nazis serving an "ascended" Hitler; the Fate, a criminal organization that makes heavy use of Mythos creatures and spells for fun and profit; SaucerWatch, a naïve yet well-funded UFO research group that may be closer to the truth than they know; and the Cult of Transcendence, among others.The tone of the book is even bleaker than standard CoC: where the basic game has investigators struggling against Mythos creatures and the cultists that serve them (and DG does include its fair share of battle against these forces) the primary adversaries are evil and/or utterly amoral humans that (attempt to) use the forces of the Mythos for their own benefit, and are becoming as amoral as them. The Stars are Coming Right, and there may not be anything that Delta Green, or anyone else can do about it...But it doesn't mean they have to make things easy for them.For the other, slightly less depressing, slightly funnier Lovecraft-meets-spy-fiction setting, see The Laundry Series.
Ancient Conspiracy: Both averted and played straight with the Cult of Transcendence. As the Alta Vendita, they've been around since the Crusades, but they underwent a significant change in leadership and purpose after the First World War showed them how much their attempts at running the world had failed.
Downer Ending: Delta Green fights the fires it sees, but it's all going downhill. Some modern CoC material hints at possible evacuation to space habitats or the Dreamlands, but nothing positive or canonical.
The Delta Green short story "After Math" details the end of the world through the eyes of an elderly Delta Green agent.
Ghostapo: The Karotechia — at least, what remains of it. An eldery worshipper of Yog-Sothoth, an undead Mad ScientistNecromancer mixing the legacies of both Herbert West and Dr Munoz from Cool Air, a humanitarian ubermensch who gets immortality and invincibility in the bargain, and the "ascended" spirit of Adolf Hitler (at least, they think it's Hitler...).
The Government: Many real-life US Federal agencies are provided for PCs to be part of, from familiar ones like the FBI and the DEA to the more obscure like FinCEN or the National Security Council. Countdown extends the roster to a number of foreign agencies.
Alternatively, if you believe one Delta Green Agent: "We're the government conspiracy. Those guys are just the government".
PISCES can be considered a variation as well considering that it's been taken over wholesale by the Shan.
The Greys: The high-tech aliens cutting secret deals with MJ-12 for fun and profit. Of course, they are not what they seem.
Groin Attack: The Skoptsi sect in Russia does this to themselves — all members of the cult must undergo castration.
Gut Feeling: The reason the Mi-Go are so interested in humans is our (to them) unnerving capability to elaborate accurate answers with little information and no clear logic chains of thought.
Interservice Rivalry: All the time between the various real-world agencies. Delta Green and MJ-12 used to have this in the short period where both officially worked for the US government.
Just Before the End: In some level, everyone knows that there is not much time left for humanity. This is why the Mi-Go created the Grey deception: to extract as much information as possible from humans before our time runs out.
Knight Templar: Delta Green agents used to go too far in their quest to both protect the American populace from the supernatural and keep the existence of the latter (and itself) a secret, particularly in the Fairfield era. Some still do.
In the words of one DG agent, "we do the horrific to prevent the apocalyptic". Later in that story, the same agent deliberately, and (we are led to believe) needfully, shoots a baby.
The Mafia: The Fate is New York City's magic-using organized crime cartel.
Rock Me, Asmodeus!: Charnel Dreams is one of the most popular bands in New York City. Their lead singer is the head assassin for the Fate, worships Nyarlathotep, and works Cthulhu Mythos spells into the lyrics of his songs.
Sacrificial Lamb: "Friendlies" are those people that support DG's cause but are not fully inducted into the conspiracy. Delta Green maintains a database with full information on each and every one, so that they can be properly "taken care of" if the need arises.
Shown Their Work: The bibliography shows a respectable collection of material regarding world history, UFO folklore, and the praxis of the US intelligence community.
The Sociopath: Adolph Lepus, literally, as he has an antisocial personality disorder.