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Cessna O-1G Bird Dog The O-1G was a two-place observation and liaison aircraft developed from the commercial Cessna Model 170 in 1949. Originally designated L-19s, Bird Dogs were used by the U.S. Air Force, Army and Marine Corps for such tasks as artillery spotting, front-line communications, medical evacuation and pilot training. In Southeast Asia, the O-1s became a USAF forward air control aircraft. A forward air controller (FAC), often an experienced fighter pilot, flew in a specific geograph

In late 1966 the U.S. Air Force selected a military variant of the Cessna Model 337 Super Skymaster, designated the O-2, to supplement the O-1 Bird Dog forward air controller (FAC) aircraft then operating in Southeast Asia. Distinguished by twin tail booms and tandem-mounted engines, it featured a tractor-pusher propeller arrangement. Having twin engines enabled the O-2 to absorb more ground fire and still return safely, endearing it to its crews. The O-2 first flew in January 1967, and producti