Naval costuming is clearly out of my lane, so I'll back away.
But while you're Googling "humour," I'll just note that my basic dive course was run in February; because we weren't Navy, we didn't 'earn' the right to wear gloves until the final day -- we suggested that the PO have sexual experience with himself. When I went back for the Dive Supervisor course, it was much less anal. All that to say, I'm quite aware of how many courses are inherently difficult.... and how many are simply made difficult due to penis size.
* Mind you, morning PT was actually motivational as we were all in better shape than the Clearance Diver LS "leading" the morning runs. I still have happy memories of him having us run up and down hills or stairs while he had to catch his breath. Simple pleasures.