This faceted appearance is a common application of the principles of stealth aircraft. Among other achievements, he was instrumental in the development of stealth aircraft technology. The F-35 is designed to require less maintenance than earlier stealth aircraft. I was a classified project to develop an air-to-air missile for use by stealth aircraft. China is furthermore engaged in developing an indigenous stealth aircraft and numerous combat drones. Another use is for microwave-absorbent coatings, particularly radar-absorptive coatings on stealth aircraft. Some new units are added such as stealth aircraft. The prototype has stealth aircraft characteristics and shaping. Upsetting this development to all-missile systems is the current move to stealth aircraft. The U.S. and Israel are the only countries to have used stealth aircraft in combat. Stealth aircraft are typically more expensive to develop and manufacture. India is also developing the fifth generation stealth aircraft. Fully stealth aircraft carry all fuel and armament internally, which limits the payload. The angularity of the male MUTO's wing design was inspired by stealth aircraft. Most stealth aircraft use matte paint and dark colors, and operate only at night.