Preventive Prep Soldiers perform preventive maintenance checks and service on an M121 mortar system at the Hobet reclaimed mine site in southern West Virginia, Jan. 12, 2018, during a three-day drill period. Air National Guard photo by Capt. Holli Nelson SHARE: Download: Full Size (0.69 MB) Credit: Capt. Holli Nelson VIRIN: 180112-Z-XR107-035C.JPG Photo Gallery