The Naval Reserve Armory in the South Lake Union neighborhood of Seattle, Washington "is a massive concrete building exhibiting restrained Moderne and Art Deco features". It was built by the Works Progress Administration in 1941–1942, and "served as an Advanced Naval Training School" during World War II. The main interior feature is a 133 x  drill hall which was used in Naval Reserve training of thousands of young recruits for service in the war. It is significant for its association with mass mobilization during the World War, for association with Depression-era work relief, and more.