The O-2 is a military version of the Cessna Model 337 Super Skymaster. Distinguished by twin tail booms and tandem-mounted engines, it features a tractor-pusher propeller arrangement. Derived from the Cessna Model 336, the Model 337 went into production for the civilian market in 1965. This unorthodox all-metal business aircraft resulted from several years of study by Cessna aimed at producing a twin-engine airplane that would be simple to fly, low in cost, safe and comfortable, while offering all the traditional advantages of two engines.