The USMC in those days was very male oriented. Very. Approximately zero women could be found in a combat environment. I don't remember seeing even one after the stewardess of the civilian transport that delivered us to Vietnam said,"good luck," to each Marine as he stepped off the plane in Danang. At the time, I considered her parting comment uncharacteristically sincere until the reality of where we were began to sink in. Many of those guys would need more than just a little luck to make it back home. I remember her because she was lovely and smelled of lilacs. If I had known it would be nearly six months before I saw another good looking, good smelling American woman like her, I probably would have lingered longer in that doorway. But there were 200 guys behind me anxious to set foot on solid ground after a long, crowded flight from Okinawa, and to be honest, I had other matters on my mind. Like a full bladder.
I should have gone while still on the plane and still in the air, I thought. But there was a long line at every restroom and I soon decided to forget it, which was a mistake. We were now on the ground and standing in another even longer line trying to get checked in. My bladder must be at about its maximum volume, I thought. Trying not to be obvious, I glanced around to see if anyone else was squirming or looking for something they could not see no matter how carefully they scanned their surroundings. No such luck. Not one guy had, "Boy, do I need to piss," written on his forehead asI'm certain was written on mine. Finally, I stepped over to a very bored young corporal in faded utilities and unpolished jungle boots and asked where I could find a restroom.
His eyes said, "You dumbass," but his lips said, "Over there if you have to take a crap, Lieutenant," pointing to his right. "Over there at that piss tube if all you have to do is piss," pointing to his left.
The incongruity of the proposal that one need required the use of one location while the other might require another, escaped me. My bladder was stretched to finality.
His first gesture was toward a rectangular structure about 6 by 8 feet with a roof that slanted toward the back. Corrugated aluminum siding was nailed halfway up the outerwalls followed by mosquito netting the rest of the way to the roof. Access was through a screen door in the middle of the front. I recognized it immediately. A two holer! My childhood, when our family had very few luxuries such as indoor plumbing, came flooding back. I had not actually used an outdoor "privvy" since I was four or five years old when our family lived in a small wooden shack next to my father's sawmill in the 1940's.
Since my particular need at the moment was less demanding than that which would require a two holer, I turned looking for what the Marine referred to as a pisstube. What in hell's name could that be? It was never mentioned in any of the manuals I had ever read. I looked in the direction of his gesture but saw nothing that met the meaning of his words. I looked back at the Corporal.
He pointed again, this time saying, "Over there, sir, by that second hootch. The pipe in the ground."
I looked again. There, off to the side of the hootch and slightly to the rear and in very dim light I saw a pipe some 4 inches in diameter protruding about 24 inches out of the ground and slightly off vertical. White powder had been thrown indescriminately around its base and lightly dusted it's orifice.

The ignominious Pisstube. Efficient. Gender specific. Immodest.
About that time a Major walked up, unbuttoned his trouser and released a very accurate stream efficiently into the tube completely unconcerned that one might think relieving himself in such a public manner might be just a tad uncouth, uncivil and perhaps even a skosh unusual. He yawned covering his mouth with one hand as he held himself with the other.
I kept a short distance back and looked discretely in another direction as he walked back toward me buttoning his fly. I saluted as he walked by and said "Good evening, sir." At thiat point my bladder and my concentration were at a breaking point. I was desperate to not wet myself as I moved quickly toward the tube fumbling with those damned buttons of my USMC utility trousers.
As it turned out, the tube was really very functional. Easy access. Easy go.
I was pleased with my accuracy, dead on, and the enormous relief that welled over me was well worth any sidelong glances that might have come my way from the line of Marines behind me. As I finished, I took a long, deep breath and turned to walk away rebuttoning my fly. I looked at the marines still standing in the dim light waiting to check in. Not one was looking me. I shoved my unwashed hands into my pockets and rejoined the line.