1st Lt. Kelli Walker photographs an Army CH-47 Chinook at Kandahar Air Field, Afghanistan, March 14, 2014. As a joint expeditionary tasked, or JET, battle damage scientist, Walker is primarily responsible diagnosing all damage of unit aircraft, reporting recovery processes and providing scientific data to improve future aircraft restoration projects. Walker is a 1st Combat Aviation Brigade battle damage materials scientist. (U.S. Air Force photo/Staff Sgt. Vernon Young Jr.)