My favorite comes from boot camp at Great Lakes.
One young recruit asked the company commander if he'd be allowed to go home when his wife had their baby. He said, Son, "You have to be there when the keel is laid, but you don't have to be there for the launching"!
He who enters covered here, shall buy the bar a round of cheer!
I got caught out on that one at Lewes, and it was the only time I was given credit until payday! Cost me over ten dollars! A lot of money for an E4 in 1972!.
How about this one??? What's the difference between a fairy tale and a sea story? A "Fairy Tale starts with "Once uppon a time" and a "SEA Story" starts with "This is no SH**.