Night Mission Soldiers walk away from a CH-47 Chinook after a night mission at Alpena Combat Readiness Training Center, Mich., Jan 28, 2021, during Winter Strike 21, a cold-weather readiness event that is part of the National Guard Bureau-sponsored Northern Strike exercise series. SHARE: Download: Full Size (1.29 MB) Tags: northern strike, Air Force, Winter Strike 21 Credit: Air Force Master Sgt. Scott Thompson VIRIN: 210128-Z-GS745-0329C.JPG Photo Gallery