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Recently, the Electromagnetic Interference (EMI) limits and test methods for the National Aeronautics and Space Administration (NASA) Space Shuttle Program (SSP) were revised to incorporate portions of MIL-STD-461E. Use of Commercial Off The Shelf (COTS) equipment is becoming the preferred solution for equipment integration whenever practicable. NASA Johnson Space Center (JSC) Electromagnetic Compatibility (EMC) engineers recommended a commercial 3-meter chamber as an optimal solution for EM1 test and flight certification that would best serve the needs of the Program over the next decade. This paper discusses that recommendation and its background, together with other issues associated with the technical specification and installation of such a chamber. chambers located at various NASA facilities around the country, among them the Jet Propulsion Laboratory, Glenn Research Center, Goddard and Marshall Space Flight Centers, and Johnson and Kennedy Space Centers. Recently, the EMI limits and test methods for the SSP were revised to incorporate portions of MIL-STD-461E, including the use of radio Gequency (RF) absorbing material when performing electric field radiated or susceptibility measurements inside a test chamber. This revision brings the SSP EM1 requirements into alignment with the current state of the art within the EMC community, and will help to ensure satisfactory EMC performance of equipment utilized on the Space Shuttle for many years to come. However, it also means that simple,