The Strategic Defense Initiative Organization (SDIO) and its proponents (the U.S. Army and the U.S. Air Force) plan to conduct Demonstration/Validation tests of the GSTS technology. These tests will demonstrate the ability of the technology. These tests will demonstrate the ability of the technology to perform required tasks, and to validate production feasibility in support of a future decision on whether to proceed with Full-Scale Development. Demonstration/Validation tests would be conducted at the Nevada Test Site, National Test Facility, Vandenberg Air Force Base/Western Test Range, U.S. Army Kwajalein Atoll, and contractor facilities. Tests would include analyses, simulations, component/assembly tests, and flight tests. This document addresses the potential environment consequences of the Demonstration/Validation testing of the GSTS technology.