As the Vietnam War dominated the late 1960s and early 1970s, AFSC focused on quick solutions to the needs of operational units in the Southeast Asia (SEA) war zone. Areas such as Electronic warfare (ECM) (Douglas EB-66 Destroyer) were greatly expanded in response to the North Vietnamese Surface-to-air missile (SAM) air defense systems. The modification of transports (AC-130 Hercules, AC-119 Flying Boxcar) into gunships, improved reconnaissance sensors, the Defense Meteorological Satellite Program, Forward Looking Infrared Sensors (FLIR), and Precision-guided munitions all represented significant AFSC contributions to Air Force operations in Southeast Asia.