Welcome to Fort Buchanan, "Sentinel of the Caribbean" and the only Army military installation in Puerto Rico and the Caribbean.  The linkage between the history of Fort Buchanan and the history of the US Army in Puerto Rico dates back to the 19th century during the Spanish-American War, the creation of the Porto Rico Regiment of Infantry and its first commander, Brigadier General James Anderson Buchanan, after whom the military installation was named. Located in the metropolitan area of San Juan, the area started as a training site in 1923 known as Camp Buchanan. In 1940 the location was designated as Fort Buchanan.     

Fort Buchanan has been under the control of the various commands throughout its history. Since 2006 it has been under the Installation Management Command (IMCOM). Fort Buchanan is host to the headquarters of the US Army Reserve, 1st Mission Support Command and the Puerto Rico National Guard.

Among the factors that make U.S. Army Garrison Fort Buchanan unique are: its key and strategic location providing fast and cost-effective support to missions in the Caribbean, Central and South America area of responsibility; its Hispanic cultural ties with Latin America; and its significant role as host of "joint" sister services reserve components representing the U.S. Armed Forces in Puerto Rico.