The Reusable Booster System (RBS) is a United States Air Force circa-2010 program to develop a new vertical-takeoff, horizontal-landing (VTHL)[1] reusable booster and a new expendable second stage to replace the existing Evolved Expendable Launch Vehicles (EELV) after 2025.[2]
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Program funding is set at US$250,000,000.[1] "Officials anticipate awarding up to three contracts for the project, where winners would compete for individual tasks of experiments and demonstrations that address technology, processes and other attributes of a reusable booster system, or RBS." The proposal deadline is 19 March 2011.[1] In December of 2011 Lockheed Martin was awarded a contract to build a flight demonstration vehicle, the RBS Pathfinder, due in 2015.[3]