This is a Request for Information (RFI) only, issued for planning purposes and not a solicitation for bids. The purpose is to identify sources capable of providing specialized engineers, scientists, and technical experts to support U.S. Naval Observatory operations and research, with work defined through future task orders. The primary place of performance is the United States Naval Observatory in Washington, D.C. The required personnel span advanced scientific and engineering disciplines, and contractor staff will need to obtain a SECRET security clearance and must be U.S. citizens or resident aliens.