The origins of the phrase "go commando" are uncertain, with some speculating that it may refer to being "out in the open" or "ready for action". Slate magazine's Daniel Engber dates the modern usage to college campuses circa 1974, where it was perhaps associated with soldiers in the Vietnam War, who were reputed to go without underwear to "increase ventilation and reduce moisture."[4]
The earliest known use of the term in print occurred on January 22, 1985, when Jim Spencer wrote in the Chicago Tribune, "Furthermore, colored briefs are 'sleazy' and going without underwear ('going commando',…