Fort Glenn was a military base on Umnak Island built in anticipation of an attack by Japanese forces during the World War II Aleutian Island campaign. The site consisted of Fort Glenn Army Air Base, an airfield of the United States Army Air Corps later renamed Cape Air Force Base, and the adjacent Otter Point Naval Air Facility. Construction of the base began in January 1942 secretly disguised as a cannery. Fort Glenn had about 10,000 personnel by the end of 1942, and the facilities eventually included hundreds of Quonset huts, storage buildings, ammunition magazines, aircraft hangars, administration offices, radio and radar facilities, and 4 paved runways. Newer air bases on Adak and Amchitka Islands further west quickly supplanted Fort Glenn as a forward operating base. By the end of 1943, the base mission had become to provide support for transient personnel and aircraft and the site was deactivated in 1947. Today hundreds of building pits, runways, and World War II artillery emplacements remain in various states of deterioration. Fort Glenn was listed on the National Register of Historic Places and declared a National Historic Landmark in 1987. Learn more here and here. Click on the picture below and download the CoastView app to explore more of Fort Glenn and Umnak Island.