1st Mission Support Command

The 1st Mission Support Command provides mission command to assigned units of the Army Reserve in Puerto Rico and the U.S. Virgin Islands to ensure unit readiness to deploy to war and successfully execute their wartime missions. Most of the Soldiers of the 1st MSC possess bilingual skills, which brings value to the Army and Joint Force. Organized Reserve units have served in Puerto Rico since 1922 when the 373rd Infantry was moved to the Organized Reserve and headquartered in San Juan. December 1973, the Support Group was placed directly under First U.S. Army. The following year, the 166th Support Group was given full mission control of all Army Reserve units in Puerto Rico and the U.S. Virgin Islands and assumed the mission and functions of a major U.S. Army Reserve Command, under First U.S. Army. From September 1990 through October 1991, more than 1,000 Soldiers were activated and deployed in support of the Persian Gulf War. In 1999, the 1st MSC was made up of more than 5,000 ...