The USAF developed a requirement for a new air superiority fighter to replace the F-15 Eagle. Two proposals were submitted with the Lockheed Martin F-22 Raptor being selected as the new Advanced Tactical Fighter (ATF). The aircraft is constructed using 39% titanium, 24% composite material, 16% aluminum and 1% thermoplastic by weight. All these components contribute to the F-22 being a light weight, extremely maneuverable, extremely fast aircraft that uses stealth technology. The F-22 is also capable of ground attack, electronic warfare and signals intelligence.