A Master Sergeant and a second lieutenant were in the latrine, each pissing in a urinal.
The MSgt finished first, zipped up and started to walk out.
The second lieutenant said to the MSgt,
“Master Sergeant, at West Point, they taught us to always wash our hands after using the urinal.”
The MSgt replied,
“Well sir, in basic training, they taught us not to piss on our hands”
and walked out.
What I had in mind was specifically British Army where they do everything by numbers.