Camp Las Casas was a United States military installation established in Santurce, Puerto Rico in 1904. The camp was the main training base of the "Porto Rico Regiment of Infantry," a segregated U.S. Army Regiment which was later renamed the "65th Infantry Regiment." The base continued in operation until 1946, when it was closed.

Colonel Gilberto José Marxuach a.k.a. "The Father of the San Juan Civil Defense", was a former officer in the United States Army who in 1951 founded and became the first director of the Civil Defense in the City of San Juan, Puerto Rico.