The Port-a-John Chronicles (1)

"You gotta love Joe. He may not always be able to voice his opinions and thoughts directly, due to military customs and courtesies (some of them respect such protocol themselves, some simply fear the retribution of their NCOs, but the end result is still the same: acquiescence), but you can rest assured he will get his point across somehow. One of the time-honored places for such backdoor honesty is the Port-a-John - a refuge where men of all ranks, all colors, and all creeds are both pantsless and alone. Shitting is humanity's great equalizer. Especially on an Army base in a combat zone."
Kaboom: A Soldiers War Journal