Vought O2U CorsairVought O2U Corsair airplane model. With deliveries beginning in December 1927, the O2U Corsair went into immediate service with the Navy and the Marine Corps. In the 1928 Nicaraguan campaign, Marine Corsairs earned further distinctions by being the first planes ever to conduct an unsupported attack against fortified positions. Attacking a force of 1,500 rebels, four Corsairs began low level strafing and light bombing against well armed positions. In