The Space and Missile Systems Center, a subordinate unit of U.S. Space Force, is the center of technical excellence for developing, acquiring, fielding and sustaining military space systems. SMC's mission is to deliver resilient, affordable and sustainable space capabilities. The center is responsible for on-orbit check-out, testing, sustainment and maintenance of military satellite constellations and other Department of Defense space systems. 

SMC's portfolio includes GPS, military satellite communications, defense meteorological satellites, space launch and range systems, satellite control networks; space based infrared systems and space situational awareness capabilities.

SMC is headquartered at Los Angeles AFB in El Segundo, Calif. The center employs an estimated 6,300 people including military, civilians and contractors at LAAFB and other locations worldwide.

Los Angeles AFB is the only active duty military installation in the greater Los Angeles metropolitan area, and offers services to eligible base personnel, retirees, service members from all branches and their families.