Bones Conway and Jack Kaufman didn’t really know what they were in for when they enlisted in the U.S. Army; they just wanted to get a job and make some money. But these new recruits are so hapless, they run the risk of getting kicked out before their military careers even begin. Soon, though, they’re sent to the Middle East to fight for their country — which they manage to do in their own wacky ways.

Two years after choosing not to kill the man who killed his son, former police sergeant Leo Barnes has become head of security for Senator Charlene Roan, the front runner in the next Presidential election due to her vow to eliminate the Purge. On the night of what should be the final Purge, a betrayal from within the government forces Barnes and Roan out onto the street where they must fight to survive the night.