1st Mission Support Command is a

United States Army Reserve The United States Army Reserve (USAR) is a Military reserve force, reserve force of the United States Army. Together, the Army Reserve and the Army National Guard constitute the Army element of the reserve components of the United States Armed F ...

command providing support to military units based in

Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...

and the

US Virgin Islands The United States Virgin Islands,. Also called the ''American Virgin Islands'' and the ''U.S. Virgin Islands''. officially the Virgin Islands of the United States, are a group of Caribbean islands and an unincorporated and organized territory ...

. Headquartered at Fort Buchanan within the metropolitan area of the Puerto Rico's capital

San Juan San Juan, Spanish for Saint John, may refer to: Places Argentina * San Juan Province, Argentina * San Juan, Argentina, the capital of that province * San Juan, Salta, a village in Iruya, Salta Province * San Juan (Buenos Aires Underground), ...

the command consists of 35 units and fields 3,800 soldiers.

History

Reserve units have served in Puerto Rico since 1922 when the 373rd Infantry was moved to the Organized Reserve and headquartered in

San Juan, Puerto Rico San Juan (, , ; Spanish for "Saint John") is the capital city and most populous municipality in the Commonwealth of Puerto Rico, an unincorporated territory of the United States. As of the 2020 census, it is the 57th-largest city under the jur ...

. In 1973, the Support Group was placed directly under

First United States Army First Army is the oldest and longest-established field army of the United States Army. It served as a theater army, having seen service in both World War I and World War II, and supplied the US army with soldiers and equipment during the Korea ...

. By 1974, the 166th Support Group was given full mission control of all United States Army Reserve units in Puerto Rico and the United States Virgin Islands and assumed the mission and functions of a major U.S. Army Reserve Command, under First U.S. Army. The Garita patch is worn by members assigned to this unit.

Subordinate units

As of 2017 the following units are subordinated to the 1st Mission Support Command: * 1st Mission Support Command, at Fort Buchanan,

** 166th Regional Support Group, at Fort Buchanan, Puerto Rico *** 346th Transportation Battalion, at

Roosevelt Roads Naval Station Roosevelt Roads Naval Station is a former United States Navy base in the town of Ceiba, Puerto Rico. The site operates today as José Aponte de la Torre Airport, a public use airport. History In 1919, future US President Franklin D. Rooseve ...

, Puerto Rico *** 393rd Combat Sustainment Support Battalion, at Fort Buchanan, Puerto Rico ** 210th Regional Support Group, in

Aguadilla, Puerto Rico Aguadilla (, ), founded in 1775 by Luis de Córdova, is a city and municipality located in the northwestern tip of Puerto Rico, bordered by the Atlantic Ocean to the north and west, north of Aguada, and Moca and west of Isabela. Aguadilla is s ...

*** 35th Signal Battalion, at Fort Allen *** 77th Combat Sustainment Support Battalion, in Aguadilla, Puerto Rico *** 448th Engineer Battalion, at Fort Buchanan, Puerto Rico ** Caribean Readiness Group, at Fort Buchanan *** 1st Battalion, 333rd Regiment (Multifunctional Training Battalion) *** 1st Battalion, 389th Regiment *** 2nd Battalion, 348 Regiment *** 49th Multifunctional Medical Battalion *** 402nd Civil Affairs Battalion

References

{{reflist Support Commands of the United States Army Military units and formations of the United States Army Reserve Military units and formations in Puerto Rico