Camp David is a 125-acre (51 ha) country retreat for the president of the United States. It is located in the wooded hills of Catoctin Mountain Park, in Frederick County, Maryland, near the towns of Thurmont and Emmitsburg, about 62 miles (100 km) north-northwest of the national capital city of Washington, D.C. It is code named Naval Support Facility Thurmont. Technically a military installation, its staffing is primarily provided by the Seabees, Civil Engineer Corps (CEC), the United States Navy and the United States Marine Corps. Naval construction battalions are tasked with Camp David construction and send detachments as needed.