Operated by the 846th Test Squadron, the Holloman High Speed Test Track is the world’s premier rocket sled test track. The mission of the 846th TS is to plan and execute world-class rocket sled tests enabling critical weapon system development in support of the warfighter using world-class people, technical excellence, cost-effectiveness and agility. At 59,971 feet, the test track is the longest facility of its type in the world. Each of the three rails that form the track is continuously welded, in tension at temperatures below 120º F, and aligned to within 0.04 inches of intended position in the operational region of the track. The track serves as a critical link between laboratory-type investigations and full-scale flight tests by simulating selected portions of the flight environment under accurately programmed and instrumented conditions, often before flight-worthy hardware is available. Test vehicles (sleds) are accelerated to mission velocities by means of solid rocket motors,...