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Research Support Instruments (RSI), since 1976, has provided research and development services, systems engineering and technical support services to government and industry clients. RSI operates from facilities in Lanham, Md. and Princeton, N.J., with additional on-site support activity at the Naval Research Laboratory in Washington. The Lanham office has focused on space missions, while the Princeton office concentrates on plasma effects and material science. RSI s core business areas are research and development, systems engineering, instrument test and calibration and experiment support. As a subsidiary of Physical Sciences Inc., RSI provides extensive capabilities and resources of a larger company coupled with the responsiveness, flexibility only a small company can offer. RSI's professional staff of scientists, engineers and technicians work on projects individually or as a team. From the long-term monitoring of atmospheric ozone to the successful Clementine lunar mapping mission, RSI personnel have played key roles in government and commercial space experiments and technology demonstrations.