Three trailer-trash reservists (Larry the Cable Guy, Bill Engvall, DJ Qualls) get called up by a bottom-scraping U.S. Army for deployment to Iraq, but wind up lost in the Mexican desert hunting for insurgents and trying to find their way to Baghdad. This bonehead comedy has echoes of the kind of movie first-time writers Bear Aderhold and Tom Sullivan have surely never seen—Abbott and Costello’s Buck Privates, say, or Martin and Lewis’ At War with the Army—but with a raunchy streak unthinkable in the 1940s or ’50s. Under C.B. Harding’s direction, the movie staggers like a sloppy drunk, hitting a level of comedy that makes those older titles look like Oscar Wilde and George Bernard Shaw. Whatever your pet sensitivity—the military, rednecks, gays, Mexicans—this movie is an equal-opportunity denigrator.