The 99th Military Base Deveselu, or the Deveselu Military Base, is a Romanian NATO base hosting the United States Navy Aegis Ashore Ballistic Missile Defense System. The base consists of three military units: The Romanian 99th Military Base, which hosts two American bases: the Naval Support Facility Deveselu and the Aegis Ashore Defense System Romania. Located in Deveselu commune, Olt County, the base has an area of 900 ha ; of those, 170 ha are used by the U.S. forces.