Howitzer Training Soldiers from the Wisconsin National Guard fire Howitzers to provide integrated fire support during Northern Strike 20-2/Winter Strike, a cold weather joint training exercise, Camp Grayling, Mich., Jan. 24, 2020. Northern Strike is the largest reserve-component DOD exercise. SHARE: Download: Full Size (1.03 MB) Credit: Air Force Master Sgt. David Eichaker VIRIN: 200124-Z-LI010-005A.JPG Photo Gallery