ROCAF has also taken part in numerous humanitarian operations. Some of the more major ones include the following: Indian Ocean earthquake and tsunami, December 2004 Haiti earthquake, January 2010 Typhoon Haiyan, November 2013 ROCAF losses Equipment and procurement Current ROCAF inventory includes over 400 combat aircraft, the mainstays being the AIDC F-CK-1 Ching-kuo IDF (Indigenous Defense Fighter) and F-16 while the Mirage 2000-5 provides the most formidable air-defense capabilities. Older F-5 fighters are gradually being phased out but remain in service. The United States serves as the ROCAF's main supplier of equipment and also provides training for ROCAF and ROC Navy pilots at Luke AFB in Arizona. This base which is between Phoenix and Tucson has an instrumented flight area for training approximately the size of the State of Connecticut. German Air Force (Luftwaffe) and German Naval Aviation (Marineflieger) who used to train at Luke AFB from 1957 to 1983 now train at NATO facilities at CFB Goose Bay in Canada and also alongside the USAF at Holloman AFB in New Mexico. As of 2019 the US Air Force is assisting the Taiwanese Air Force in sourcing new and surplus F-5 parts. Domestic development Prior to 1984, ROCAF fighters were almost exclusively American-made aircraft sold under terms of a mutual defense treaty between the Republic of China and the United States. Development of the F-CK-1 Ching-kuo Indigenous Defense Fighter (IDF) began in 1984 due to U.S. refusal to sell F-20s and F-16s to the ROCAF as a result of changes in national policy between the U.S. and the People's Republic of China. After a successful maiden flight in 1989, the domestically produced fighter entered service in 1994. However, the ROCAF was subsequently able to obtain F-16s from the United States as well as Mirage 2000-5 fighters from France, resulting in delays to later IDF development that had been anticipated. In response to American refusals to supply "smart bombs", Taiwan is developing their own equivalent of the Joint Direct Attack Munition for attacks against the PRC mainland in case of invasion preparations. Taiwan is looking to replace its current fleet of AT-3 jet trainers and F-5 LIFT planes with 66 advanced trainers. In 2008 the Republic of China Air Force released a request for information (RFI) and two companies including Lockheed Martin for the T-50 and Alenia Aermacchi's M-346 responded to the request. These planes were expected to be license produced