Noble Defender Alaska Air National Guard Tech. Sgt. Matthew O'Brien practices radio communications in Southcentral Alaska, Jan. 21, 2021, during Noble Defender, a North American Air Defense Command Arctic air defense operation. SHARE IMAGE: Download Image: Full Size (0.79 MB) Tags: Air Force, Training, Noble Defender Photo By: Air Force Senior Airman Kelly Willett VIRIN: 210120-Z-SV928-1002C.JPG Photo Gallery