what is a klick military

In military terms, a "klick" is a slang term used to denote a distance of one kilometer or 1,000 meters. The term is commonly used by military personnel across the world, as it aligns well with the use of 1 kilometer by 1 kilometer grid squares on military maps, and is easier to hear over the radio than "kilometer". The origin of the term is uncertain, but it was likely invented in World War I or the Vietnam War. Despite the popularity of the term "klick" as military jargon from the Vietnam War era and onward, some sources report the possibility of "klick" or a similar early modification of "kilometer" being used as early as World War I.