Q:McChord Field Historic District is a historic district located within the McChord Air Force Base in Pierce County Washington. The base is located at the base of Puget Sound. The 31 contributing buildings and 3 contributing structures included in the district all date to the establishment of McChord Field and its role in World War II. Additionally the district is significant for its architecture representative of the period from 1938 through 1952. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building