Over the years, the mission and the aircraft underwent many changes and roughly 380 were built over all variants. Mohawk variants included the JOV-1 reconnaissance, OV-1A, and photographic, OV-1B photographic, and side-looking radar (SLAR) pod, the OV-1C photographic, and infrared, and the OV-1D (SLAR pod and bigger wings), OV-1E fuselage for more sensor operators or cargo, EV-1E electronic intelligence installation and RV-1E ELINT reconnaissance. A four-engined Model 134E with tiltwings and tail ducted fan for control for VTOL was proposed to the Army but not built. Model 134R was a tandem cockpit version offered to meet the Light Armed Reconnaissance Aircraft (LARA) requirement, but the NA300 was chosen instead becoming the OV-10.