The situation is simple. A Delta Green operative has gone missing from a US military base in Afghanistan. The party, also Delta Green operatives, are sent to find out what happened - and retrieve the missing person if possible. It's assumed that the party are already in Afghanistan - as soldiers, intelligence agents, civilian contractors or the like - and some pregenerated characters are provided if required. In a delightful twist, they're told that whatever they really are, they will pose as CIA agents who are posing as Army intelligence specialists and civilian advisors... and of course, they are not supposed to let on that they are CIA, never mind Delta Green!
The background information for the Handler (GM) explains what the missing man was doing, and why he was in this particular base in the first place. There's also comprehensive information about the base itself and the few people still there - it was in the process of being handed over to the Afghani Army as the Americans reduce their presence in country. Gathering information about the agent's disappearance will require a lot of interaction, and all that's needed to role-play this to effect is provided. Everything seems to be centred on a mysterious village called Kali Ghati, which nobody seems prepared to admit exists, let alone want to go there.
This should be enough to get the party wanting to go there. Naturally, it's not exactly safe driving through Taliban-infested country, never mind the sort of issues Delta Green is there to combat... and there's a neat firefight to get through before they actually reach the place (not to mention that they might be on foot by then, with a harsh environment to contend with along with all their other ills). Eventually they'll get there, and find a weird bunch of villagers to interact with - again, you're given what you need to make them come alive in the game.
The climax of the adventure takes place in a cliff-top temple, which the party will have to climb up to and explore... and survive, if they can. Overall, it's a neat little adventure suitable for use as a one-off or campaign starter (for either of which you might use the pre-generated characters) or, if you have a reasonably military-oriented group, something you can weave into an existing campaign. Alien horrors, unfamiliar cultures, sheer desperation that could so easily turn into despair... it's all here.