and 924th OSF, the group is charged with working with the Regular Air Force's 355th Fighter Wing to functionally integrate with the 355th Operations Group and 355th Maintenance Group to conduct A-10 pilot training at Davis–Monthan AFB. Tenant units Twelfth Air Force Davis Monthan is headquarters of Air Combat Command's Twelfth Air Force and the 612th Air and Space Operations Center which operates AFSOUTH's Combined Air and Space Operations Center (CAOC). Other Direct Report Units include the 612th Air Communications Squadron. 55th Electronic Combat Group 55th Electronic Combat Group, a geographically separated unit (GSU) of the 55th Wing at Offutt Air Force Base, Nebraska 41st Electronic Combat Squadron (EC-130H) "Scorpions", blue tail stripe 42d Electronic Combat Squadron (EC-130H) "Raptors", yellow tail stripe 43d Electronic Combat Squadron (EC-130H) "Bats", red tail stripe 755th Operations Support Squadron 755th Aircraft Maintenance Squadron 309th Aerospace Maintenance and Regeneration Group (AMARG) The 309th Aerospace Maintenance and Regeneration Group (AMARG) is part of Air Force Materiel Command and is responsible for the base's aircraft "graveyard", the largest in terms of number of planes in the world, where old military and other aircraft are stationed either to be stored indefinitely, demilitarized for museum or monument display, stripped and pulped/recycled, or restored for service. 943rd Rescue Group The 943rd Rescue Group is an Air Force Reserve Command unit assigned to Davis–Monthan that falls under the 920th Rescue Wing (920 RQW) at Patrick Space Force Base, Florida The group comprises the following units. 305th Rescue Squadron (HH-60G) 306th Rescue Squadron (Pararescue) 943rd Aircraft Maintenance Squadron 943rd Aerospace Medicine Squadron 943rd Operations Support Flight Arizona Air National Guard The base provides additional active duty support to the 162d Fighter Wing (162 FW) of the Arizona Air National Guard and the Air National Guard Air Force Reserve Command Test Center, both located at Tucson Air National Guard Base at nearby Tucson International Airport, and both of which fly the F-16C and F-16D Fighting Falcon, with the latter also operating an A-10 Thunderbolt II detachment in concert with the 355 FW at Davis–Monthan AFB. The 214th Attack Group (214 RG) of the Arizona Air National Guard operate the MQ-1 Predator. Other activities Also located on base is the 25th Operational Weather Squadron 25 OWS. The squadron produces forecasts for the Western United States and is part of the 1st Weather Group (1 WXG) headquartered at Offutt Air Force Base, Neb. The squadron