The mission of the 1st Medical Brigade, the "Silver Knights," is to provide command and control, administrative assistance, and technical supervision of assigned and attached medical units, while providing combat health support to supported forces; and be ready to deploy medical support packages on short notice. As of 2005, the 1st Medical Brigade was the oldest color-bearing medical unit in the United States Army. The 1st Medical Brigade was first organized in France in 1917 as the 1st Sanitary Train from units that had been deployed along the Mexican border. It was assigned to the 1st Division (which would later become the 1st Infantry Division), the first American Unit committed to offensive operations in World War I. It 9s this event, the Battle of Cantigny on 28 May 1918, which the unit's organization day commemorates.