The United States Naval Observatory
The USNO mission is to determine the positions and motions of celestial objects, to provide astronomical data, to measure the Earth's rotation and to maintain the Master Clock for the United States. http://www.usno.navy.mil/
Naval Research Lab Homepage
The Naval Research Laboratory (NRL) is the Navy's corporate laboratory. NRL conducts a broadly-based multidisciplinary program of scientific research and advanced technological development directed toward maritime applications of new and improved materials, techniques, equipment, system, and ocean, atmospheric, and space sciences and related technologies. http://www.nrl.navy.mil/