The 1st Brigade, 104th Division is an training brigade of the United States Army. It is a training component of the United States Army Reserve, and subordinate to the 104th Division based in Fort Lewis, Washington. It is primarily responsible for One Station Unit Training, Basic Combat Training and Military Police instruction.
The 1st Brigade traces its lineage back to the old headquarters element of the division. The 104th Infantry Division's original headquarters element was first constituted on 24 June 1921 as the 104th Division, before being organized and activated in October of that year in Salt Lake City, Utah. Assigned to the division were the 207th and 208th Infantry Brigades, containing the 413th, 414th, 415th, and 416th Infantry Regiments. As a unit of the Organized Reserves, the division represented assets from the states of Washington and Montana, among other areas of the northwest United States.
In 1967, the division's former headquarters element became 1st Brigade, 104th Division, activated at Vancouver Barracks. At this time, the army began colsolidating its training units across the country, and as a result, the 104th Division took on missions of One Station Unit Training, Basic Combat Training, Advanced Individual Training, and Combat Support training. 1st Brigade took on basic combat training, a role it continues to this day
In the 1970s and 1980s, the brigade also took on One Station Unit Training and training for Military Police units. In 2005, the Base Realignment and Closure process included the closure of the Vancouver Barracks, and the 1st Brigade, 104th Division was subsequently relocated to Fort Lewis, Washington, though its duties remained the same.