The need for a Puerto Rican National Guard unit became apparent to Major General Luis R. Esteves, who had served as an instructor of Puerto Rican Officers for the Porto Rico Regiment of Infantry at Camp Las Casas in Puerto Rico. His request was met with the approval of the government and Puerto Rican Legislature. In 1919, the first regiment of the Puerto Rican National Guard was formed, and General Luis R. Esteves became the first official Commandant of the Puerto Rican National Guard.