The 158th Infantry Brigade is an infantry brigade of the United States Army. It has subordiate battalions throughout Florida and Puerto Rico. The 158th Infantry Brigade is an AC/RC unit based at Camp Shelby, Mississippi.The unit is responsible for training selected United States Army Reserve and National Guard units in Florida and Puerto Rico. The brigade was activated using the assets of the 2nd Brigade, 87th Division. The brigade is a subordinate unit of U.S. First Army.