mil-spec

Origin: Clipped compound: . Originally capitalized (MIL-SPEC) in the extensive lexicon of initialisms, acronyms, and clippings of the U.S. (and other) militaries and defense industries, which began in the nineteenth century but greatly proliferated in the mid-twentieth century and has remained large and growing since then. More at Wikipedia under United States Military Standard. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).