Courtney Birkett, 733rd Civil Engineer Division archaeologist, cleans an artifact at Fort Eustis, Va., Dec. 16, 2013. 733rd CED archaeologists catalog discoveries from Fort Eustis' 232 sites and check for damage from erosion or illegal digging. Birkett hails from Lancaster, Pa. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)