Humorously called the place where National Guard or Reserve military personnel go after initial training whereas Active duty armed service members will be assigned to a permanent duty station, or base. Reserve and National Guard get to go home after training and only have additional training once a month and two weeks out of the summer. They have the chance to be lazy at "Fort Couch" until duty calls.
Private Smith: I got my orders to go Fort Benning. Have you gotten yours?
Private Osborn: Oh, I am already assigned to a unit. I am Reserve.