Fei propietary products have been used in guidance,navigation,communications,radar,sonar surveillance and electronic countermeasure and timing systems.They are in use on many of the United States' most sophisticated military aircraft,satellite and missiles. Fei's cesium beam atomic clock is presently employed in low frequency secure communicaions, surveillance and positioning systems for the United States Air Force, Navy and Army.
While FEI will not aggressively seek defense contracts Martin will do anything asked for the good of the country. FEI is a subcontractor to all major defense companies in the United States. NASA used FEI's quartz timing system for the Space Shuttle and Voyager Missions. They also helped RTN during the Gulf War.