Indonesia purchased 12 OV-10F aircraft and operates them in COIN operations similar to the U.S. Navy's Vietnam missions with their Broncos, but have retrofitted .50 in (12.7 mm) Browning heavy machine guns in place of the .308 in (7.62 mm) machine guns. These aircraft were based in Lanud Abdulrachman Saleh Air Force Base in Malang, East Java and were vital in the invasion of East Timor and ensuing COIN operations. In 1977, they were also used during the aerial bombardments of Amungme villages near Freeport-McMoRan area of operations, West Papua, in response to OPM attacks on the mining company facilities, and of Dani villages in Baliem Valley, also in West Papua, in response to rebellion against enforced participation in the Indonesian general election. Due to the lack of U.S. bombs, the Indonesian Air Force modified the bomb racks to carry Russian bombs. The Indonesian Air Force plans to replace their OV-10Fs with EMBRAER Super Tucanos following a fatal accident on 23 July 2013.