Camp Las Casas, located in the district of Santurce, served as the main training camp for the Puerto Rican soldiers prior to World War I and World War II; the majority of the men trained in this facility were assigned to the "Porto Rico Regiment of Infantry" which was renamed the 65th Infantry Regiment of the United States Army by the Reorganization Act of June 4, 1920. The 65th Infantry was deactivated in 1956 and became the only unit ever to be transferred from an active Army component to the Puerto Rico National Guard.