Model USA Kit #001. 1:48 scale. Model USA produced this model kit in the late 1980s with markings for three aircraft. These small low-flying airplanes were used in Korea and Vietnam to spot enemy troops at 1,000 feet. Markings include O-1E Bird Dog, USAF 19 TASS, 505 TCG; South Vietnam AF, 124 OS and JASDF 1 OS.