The Simpsons (1989): Season 18, Episode 5

18 - 5: GI (Annoyed Grunt)

After Bart gets out of a commitment to join the Army at 18, Homer falls prey to a couple of Army recruiters and lands himself in basic training. Homer, of course, treats it like summer camp and infuriates his hard-nosed colonel when he is unfazed by the constant hazing and humiliation. Homer is assigned as the enemy of the Army's war games, but when the war games get out of hand and Springfield becomes the battlefield, Homer and the Springfield community must join forces before the city goes up in smoke.