Heated Battle U.S., Estonian, Latvian and Bulgarian service members battle a simulated aircraft fire at the Alpena Combat Readiness Training Center in Alpena, Mich., July 22, 2019, during Northern Strike, a National Guard Bureau-sponsored exercise. SHARE: Download: Full Size (1.86 MB) Tags: Air Force, Air National Guard Credit: Air National Guard Tech. Sgt. Lealan Buehrer VIRIN: 190722-Z-EU280-2231C.JPG Photo Gallery