There are 18 major camps or cantonment areas spread across 125,000 acres of varied terrain at Camp Pendleton Marine Corps Base. These cantonments are a World War II legacy designed to thwart an attack on the base. One of the largest is 41 Area, a 50-acre site that supports a mini base with its own personnel quarters, fitness center and mess hall, and is home to operational and community facilities for the 1st Reconnaissance Battalion (RECON) and the 1st Air Naval Gunfire Liaison (ANGLICO).