Building 5 was the first permanent post headquarters building and later the Judge Advocate General building. Built in 1911 as a dairy creamery for a dairy farm, it became the Officers' Mess in 1919. In 1924 it became the Post Headquarters, headed by the garrison commander, and major tenants included Infantry School Headquarters until 1935, the General Staff, Chaplain, legal offices, and the Infantry Test Board. From 1948 to 2009, thousands of courts-martial were held there, including U.S. v. Calley in 1971. The building expanded several times during its 98-year existence: in 1925, as Post Headquarters, a second brick building with a connecting corridor was added; in 1943, during World War II mobilization, the brick buildings were merged and a large wing was added, tripling its size; and in 1948, a courtroom was built within the wing. In 1964 the Post Headquarters relocated and the building became the Judge Advocate General building. It was destroyed by arson on February 6, 2009.