U.S. Army Pvt. Andrew Hewett, an Advanced Individual Training student assigned to the 2nd Battalion, 210th Aviation Regiment, places safety wire on a CH-47 Chinook engine during training at Fort Eustis, Va., Feb. 20, 2013. The battalion estimates it will train more than 4,000 Soldiers in various levels on helicopter maintenance. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)