Air Force Tactical Air Control Party airmen with the 147th Air Support Operations Squadron, Texas Air National Guard, walk toward a CH-47 Chinook from the South Carolina Army National Guard, 2-238th General Support Aviation Battalion, during the Global Guardian Exercise at the Combat Readiness Training Center, Townsend Bombing Range, Ga., Feb. 16, 2012. Global Guardian is an Air National Guard sponsored training exercise to provide a requirements-based training exercise utilizing unit Mission Essential Task Lists and Master Sequence of Events List injects.