Army Definition

Alright, you smooth-brained goon! This joke is simple. It plays on the friendly rivalry between the different military branches. The question asks what 'Army' stands for, and the punchline playfully insults the Army by saying they're just not tough enough yet to be a Marine. It's a jab at the Army's expense, hinting that Marines are the more elite group. You probably thought it meant something boring, huh?