Shepherd Field Air National Guard Base is located near Martinsburg, West Virginia, United States, and serves as the home base for the West Virginia Air National Guard. The facility was constructed in 1955 and has been operational since that time. It is owned by the Department of Defense and operated by the US Air Force, with control exercised by the West Virginia Air National Guard. The primary unit stationed at the base is the 167th Airlift Wing, which operates aircraft such as the C-17A Globemaster III. The airfield is shared with the Eastern West Virginia Regional Airport, indicating a dual military and civilian usage. The base has an elevation of 172.2 meters (565 ft) above mean sea level. It features one runway, designated 8/26, which is 2,686.8 meters (8,815 ft) in length and has an Asphalt/Grooved surface. As of May 2016, the U.S. Air Force has been investigating potential groundwater contamination from industrial chemicals, specifically aqueous film forming foam, originating from the base into the Big Springs wellhead-protection area.