For the next decade, operations at Los Alamitos were routine. In 1970, however, the Navy closed the station as a Naval Air Reserve training facility and let it serve merely as a Naval Air Station. In 1972, helicopter elements of both the California Army National Guard and United States Army Reserve moved from leased facilities at commercial airports to NAS Los Alamitos. Following approval of an environmental impact statement filed in August 1973, the base was designated an Armed Forces Reserve Center for which the Navy was designated host, and the California Army National Guard was charged with operating the airfield.