Lt. Gen. John F. Thompson, Space and Missile Systems Center commander and Air Force Program Executive Officer for Space, left, and Tom Wilson, vice president and general manager of the Strategic Space Systems Division of Northrop Grumman, stand in front of a full-scale Vela satellite model at SMC's Heritage Center in Los Angeles, California, May 4, 2021. Originated in 1960, Vela was the first space-based system used for nuclear surveillance. Today, the mission of monitoring nuclear detonations continues with payloads hosted on GPS satellites. (U.S. Space Force photo by Van Ha)