Cessna L-19A 51-12227 Signal CorpsThese are 1 72 scale decals for Cessna L 19A Bird Dog 51 12227, operated by the United States Army Signal Corps as a permanent testbed. The U. S. Army Signal Corps was responsible for developing and fielding military communications, electronics, and intelligence systems, and the L 19A Bird Dog proved a versatile and practical airborne platform for evaluating new radio, antenna, and communications equipment in flight conditions. As a permanent testbed,