Throughout the Cold War era, radar and antenna related applications remained a prominent research activity in EES' contracts with the Defense Department. Millimeter wave radar research, in particular, was prominent in EES' defense activities from the late 1950s, when the first military-designation millimeter-wave radar was built at Georgia Tech, to the 1980s, when GTRI developed what was then the world's highest frequency microwave radar. EES' high-frequency radar research found applications in radio astronomy, meteorology and climate studies, which improved weather forecasting and climate models and assisted in NASA's planning of the Cassini and Galileo missions. Expansion of EES' antenna research in the 1970s, in particular, the development of an air defense antenna for the U.S. Army Missile Command, resulted in the establishment of the Huntsville Research Laboratory, GTRI's oldest off-campus research center.