The History of the Eagle is as described by Great Wall Hobby: The McDonnell Douglas (now Boeing) F-15 Eagle is an American twin-engine, all-weather tactical fighter designed by McDonnell Douglas to gain and maintain air superiority in aerial combat. It is among the most successful modern fighters, with over 100 aerial combat victories. Following reviews of proposals, the United States Air Force selected McDonnell Douglas' design in 1967 to meet the service's need for a dedicated air superiority fighter. The Eagle first flew in July 1972, and entered service in 1976. The Multi-Stage Improvement Program (MSIP) is a joint program carried out by Boeing and the USAF's Warner Robins Logistics Center in Georgia. Under MSIP, upgrades were progressively incorporated onto the production line and then retrofitted to earlier production aircraft.