The Fall of Delta Green: base on the RPG Delta Green (includes materials - from among others - Trail of Cthulhu)

It is the 1960s. The stars are coming right.
The United States declares war on poverty & sends half a million troops to Indochina; desegregates voting booths & shoots rockets at the moon. Everyone believes that if we put our mind to it and our backs into it, there’s nothing we can’t do to make the world better, for America & everyone else.
You know that this is a lie. You are an Agent of DELTA GREEN, an authorized but unacknowledged black program of the U.S. national security establishment, tasked to hunt & destroy the Cthulhu Mythos. You know that plans & ideals, peace & love, matter less than a single atom drifting in the galaxy. All you can do is rage against doom, burn out your mind & body, & damn your nonexistent soul keeping your family, your country, your planet, ignorant & safe for one more day.
Written by ENnie Award-winning designer Kenneth Hite, The Fall of DELTA GREEN corebook adapts DELTA GREEN: THE ROLE-PLAYING GAME from Arc Dream Publishing to the award-winning GUMSHOE system. It opens the files on a lost decade of anti-Mythos operations both foreign & domestic, the last days of DELTA GREEN before the Joint Chiefs shut the program down in 1970.
Players take on the role of DELTA GREEN operatives, assets, & friendlies, in deadly one-shot adventures or a campaign spanning the years from hope to madness. Hunt Deep Ones beneath the Atlantic, shut down dangerous artists in San Francisco, & delve into the heart of Vietnam’s darkness.
The Fall of DELTA GREEN features:
Lethal combat & covert action in the 1960s, featuring assault rifles, flamethrowers, mortar shells, spy cameras, truth drugs, & getting rid of the bodies DELTA GREEN operations always seem to leave behind.
“Back in the World” vignettes that let you explore the human side of your Agent’s life—and often track their slow destruction by DELTA GREEN.
The rich world of the Delta Green Mythos, including a gazetteer of unnatural lands, the desperate trut