It's in the evening, and a marine old timer is sitting along a bar with a young brash airman, a younger and brasher soldier, and an even younger and an extremely brash sailor. Having a few beers, the three younger men get around to boasting about the last time they got laid.

"Well, said the the airman, "Last month-- me and my girlfriend got down to business in the woods. It was great."

"Last month?" said the soldier. " Too long. I picked up a chick from this same bar just two weeks ago and banged her til she could no longer stand."

"Two weeks ago?? That's ancient history!", crowed the sailor, "Last weekend, I visited a prostitute and got me the best [...] I've yet had!"

The Marine sat by silently, slowly sipping at his beer. The other three noticed his presence and turned towards him, "Hey, when was the last time for you, old timer?"

"Oh, about 1945." was the old Marines' reply.

"1945!?!" They all said incredulously. "That is waaaaay to long to go without getting laid!"

"I don't think so," said the old Marine, "the clock on the barroom wall only says 2108."