Fort Missoula's first chapel was completed in 1885. During the late 1930s, Works Progress Administration funds were used to renovate the deteriorating building and create a new post headquarters with an upstairs courtroom. A concrete foundation was poured adjacent to the chapel, which was then hoisted up and moved to the new location, and the current building was built around the chapel structure. Some of the original chapel walls and windows were found during restoration in 2009. After the bombing at Pearl Harbor, more than 1,000 Japanese Issei, first-generation non-American citizen immigrants, were taken from their homes by the FBI and brought to Fort Missoula, where the U.S. Department of Justice detained and questioned these men as "enemy aliens." The Alien Enemy Hearing Boards operated under an assumption of guilt, requiring each detainee to prove loyalty to the United States without legal representation or information about alleged crimes, and these boards decided whether a man would be recommended for parole, release, deportation, further investigation, or continued internment at a U.S. Army detention camp. Although the boards uncovered no cases of espionage or sabotage, most Issei men remained incarcerated for the duration of the war and could not seek U.S. citizenship until 1952. At Fort Missoula, these hearings took place in the second-floor courtroom of this T-1 building. Behind building T-1, the Colonial Revival style Building T-2 was constructed in 1906 as a Post Exchange where soldiers could buy food, beer, wine, jewelry, and other personal items and gifts, and it also included a gymnasium where movie nights were held.