A soldier in Afghanistan hasn't had a good lay in weeks, and he's starting to lose his mind. He approaches his unit's commanding officer and explains his situation.
"Sarge, I haven't had a good lay in weeks and I'm starting to lose my mind. Got any advice?"
The soldier's been a hell of a team player and invaluable in the field, so the Sarge lets him in on a platoon secret.
"Alright, son, go to Tent 3V tonight after 2330. You'll see a hole in a wall. Don't ask any questions, just stick your dick through it."
The soldier is confused, but desperate, so that night at 2335 he heads over to the tent. Sure enough, there's a hole in a wall, and without asking any questions, he sticks his dick right in. Suddenly, he's overcome with a euphoria that only a desperate, deprived man can describe. He goes to town on it and has the best lay of his life, and comes back every week after 2330 and gets his rocks off.
One night though, he sticks his dick through the hole and finds nothing there. He immediately goes to his commanding officer.
"Sarge, I went to Tent 3V and there was nothing in the hole!! I need this, sir, what's going on?"
The commanding officer checks a clipboard.
"Ahh, we're in a Week F rotation. You're up."