With today's all-volunteer armed forces, we might forget how common military service once was. Throughout most of the 20th century, young men could expect to be called up for World War I, World War II, the Korean War, or the Vietnam War. In between wars, service was seen as a useful bridge to manhood, or to see the world, or to learn job skills. So it wasn't odd to see half the houses in your neighborhood occupied by a veteran and his family. The language they brought back from their service could be colorful, but even when it wasn't, these veterans retained a lot of jargon that fellow veterans would understand, and soon those terms were used by everyone. We know what these terms mean, but we don't know how they came about. Weird History looks at a whole bunch of everyday phrases and idioms we use that you might not know came from the military, as far back as the Revolutionary War.
I can't vouch for how accurate these stories are. Commenters at YouTube are especially upset about "balls to the wall," which they contend predates aviation.