Supposedly based on someone's book that includes elements of non-fiction, meaning there has been military experiments with the paranormal, LSD etc, though I can't say whether it actually all dovetailed together post-Viet Nam and in Iraq as the movie lays it out. George Clooney, Jeff Bridges, Stephen Lang, Stephen Root for godsakes - it should have been funnier than it is. I think Ewan MacGregor was weak in this - whoever edited the trailer has better comedic timing imo.

Sometimes reality isn't funny enough...