147th Operations Squadron (U.S. Air Force) The 147th Operations Squadron is a military unit within the United States Air Force (USAF). Its primary function is to provide operational capabilities for air and space missions as part of the USAF’s Air National Guard. The squadron, stationed at Portland International Airport in Oregon, operates the E-3 Sentry, an Airborne Warning and Control System aircraft designed to provide continuous battlefield surveillance and command and control information to ground-based forces. The 147th OS provides essential air support to civil authorities and offers contingency response capabilities to the North American Aerospace Defense Command (NORAD).