Alaska Air National Guard Tech. Sgt. Matthew O'Brien, survival, evasion, resistance, and escape specialist with the 212th Rescue Squadron simulates combat search and rescue tactics in Southcentral Alaska by practicing UHF/VHF radio communications Jan. 21, 2021, as part of Operation Noble Defender. Noble Defender is a North American Air Defense Command Arctic air defense operation. (U.S. Air National Guard photo by Senior Airman Kelly Willett/Released)