Davidson-Cadillac armored car: A special development of 1915 by Major Royal P. Davidson (who later graduated to the rank of Colonel). Among other vehicles designed for military use, including machine-gun and searchlight carriers, he put together a fleet of 8 military vehicles on Cadillac chassis including a scout car (with a periscope), two communications cars (wireless), a kitchen car (with ovens), a hospital car, a balloon destroyer, a quartermaster's car and the first full armored car.