Fort Allen, officially Fort Allen Training Center, is a Puerto Rico National Guard military installation located on a 921-acre facility in Juana Díaz, Puerto Rico. History Losey Field was established by the Army Air Corps in 1941 and was used during World War II by fighter & bomber units. It was named for Captain Robert M. Losey, an aeronautical meteorologist who in April 1940 became the United States' first military casualty in World War II. Units assigned were: 4th Tactical Reconnaissance Squadron (13th Composite Wing, 72nd Observation Group) 1 April 1941 – 27 October 1943 20th Troop Carrier Squadron (Sixth Air Force Base Command) 10 May–June 1942 36th Fighter Group (Headquarters), January 1941-May 1943 22d Fighter Squadron, 6 January-13 December 1941 (P-40 Warhawk) 23rd Fighter Squadron, 6 January-31 May 1941; 15 November-13 December 1941(P-40 Warhawk) 32d Fighter Squadron, 6 January 1941-19 February 1942; 9 March-14 June 1943 (P-40 Warhawk) 417th Bombardment Squadron (25th Bombardment Group) 29 May 1943 – 24 March 1944 (B-18 Bolo) Subsequently: 1944: After the departure of the 417th Bombardment Squadron in 1944, the airfield was turned over to Army ground forces. 1949: Losey Army Airfield was transferred to United States Army (USA) ground forces and became Camp Losey. 1950: Camp Losey was renamed Fort Allen. 1959: Fort Allen was transferred to the Army's Caribbean Signal Agency. 1963: The United States Navy (USN) took control of the military post and redesignated as Naval Radio Station Fort Allen, Puerto Rico. 1970: The Headquarters & Communications Center of Naval Communication Station (NAVCOMMSTA) Puerto Rico relocated from San Juan to Fort Allen. 1980: The U.S. Navy moved the Naval Communication Station Puerto Rico Headquarters & Communication Center from Fort Allen to Naval Station Roosevelt Roads. 1980: On 16 November 1980 Fort Allen became the home for the United States Army Reserve (USAR) 35th Expeditionary Signal Battalion. 1981: The United States Immigration and Naturalization Service (INS) under a presidential order reconfigured Fort Allen as a processing center for Cuban and Haitian refugees. 1983: Fort Allen was officially transferred to the Puerto Rico National Guard (PRNG). The 35th Signal Battalion, along with other U.S. Army Reserve units remain as tenants. 1985: The Puerto Rico National Guard Language Center (PRNGLC) relocated to Fort Allen. 1997: The U.S. Navy built a receiver site for the Relocatable Over-the-horizon radar (ROTHR) on government land at Fort Allen. 1999: The National Guard Youth Challenge Program was established