I was only in the Marine Corps for 4 years, so my experience is not expansive... but my "A" school, after boot camp, was 6 months in a multi-branch school (Army, Navy, and Marines.) One fellow in my platoon in boot camp was hung way above average, and liked to brag that he used to do porn. But the poor thing had an IQ just slightly below that of a garnet, and was exceptionally unattractive physically and personality-wise. My roomie in "A" school was a Marine, beautifully hung, super cute, and mostly straight - we never fooled around. All the other Marines, Sailors, and Soldiers I saw naked were fairly average. The 3 years, 3 months in the 1st Marine Division there were 5 in my platoon who were well-hung. Of about 60 in the unit, about half were men... so seems that the percentage there was about 17 percent. I actually just surprised myself by remembering that, I started this post to say that the military was about in line with the general public. Hmmmmmmm