The Sultan of Oman's Air Force (SOAF) was formed with British personnel and aircraft in March 1959. The first aircraft were two Scottish Aviation Pioneers transferred from the Royal Air Force. The first armed aircraft was the Percival Provost T52. In 1968 the SOAF received the first of 24 BAC Strikemaster jet trainer and light strike aircraft for operation against insurgents in the Dhofar region. In 1974 the SOAF was expanded with orders for the Britten Norman Defender, BAC One-Eleven, BAC VC10 and 32 Hawker Hunter ground attack aircraft. In 1977 Jaguar International joined the SOAF, followed in the 1980s by the BAe Hawk. In 1990 the SOAF was renamed the Royal Air Force of Oman (RAFO). In 1993 and 1994 the RAFO replaced its Hawker hunters with four BAE Hawk Mk 103 lead in fighter-trainers and 12 single-seat Hawk Mk 203, equipped with Westinghouse APG-66H radar, as light ground attack/interceptors. In September 1997 after the evaluation of new combat aircraft the RAFO decided to upgrade and extend the service lives of its remaining 17 SEPECAT Jaguar ground attack fighters until the second decade of the 21st centuary. A contact was placed with the United Kingdom Ministry of Defence to upgrade the avionics of the Jaguar aircraft for $40 million. In 2005 deliveries started of the F-16, equipped with improved GPS/INS. The aircraft can carry a further batch of advanced missiles; the AGM-88 HARM missile, JDAM, JSOW and WCMD. Block 50 aircraft are powered by the F110-GE-129 while the Block 52 jets use the F100-PW-229.