The former marine welcomed his son home from his first tour of duty where,like his father, was a paratrooper too..

Dad: Son, I'm proud of you! How was your first jump?
Son: Well, Dad, not too well actually.
Dad: Really? What happened?
Son: Well, when we got over the drop zone everyone started to pile out of the plane but I just couldn't do it...I just couldn't jump.
Dad: So? What happened next?
Son: Well, the staff sargent who's this big son o' bitch comes over, pulls his huge pecker out and says "You'd better jump or I'm gonna shove this up yer ass!"
Dad: So..did you jump?
Son: Yeah, a little at first...