The -22 Raptor fighter is a single-seat, double-shot, high-stealth fifth-generation fighter jointly developed by Lockheed Martin and Boeing of the United States. The F-22 is the world's first fifth-generation fighter to enter service. The F-22 entered the service of the United States Air Force in the early 21st century to replace the fourth-generation F-15 Eagle fighter. Lockheed Martin is the main contractor responsible for designing the final assembly of most of the fuselage, weapon systems and F-22. The plan partner Boeing provides wings, rear fuselage, avionics integrated systems and training systems. Lockheed Martin claims that the raptor's stealth, sensitivity, accuracy, and situational awareness capabilities combine its air-to-air and air-to-ground combat capabilities, making it the best integrated fighter in the world today. However, due to the high manufacturing cost of the F-22 and the delay in the planning of the Russian and Chinese fifth-generation fighter jets, there was a lack of clear air-to-air combat missions and Raptors.????