Sitka Naval Operating Base and U.S. Army Coastal Defenses was listed as a National Landmark in 1986. It is also known as Sitka, the Causeway, and Mt. Edgecumbe School. During the beginning of World War II, it was among the few installations prepared to guard the North Pacific against enemy incursion. Airplanes stationed at the base patrolled the southeast Alaskan waters, tracking reported submarines and watching for other enemy activity.