The regiment's service during this campaign earned it the French Croix de Guerre and the World War I Victory Medal.

In the interwar period, the 21st Field Artillery Regiment was reorganized several times and served as both a National Guard and Regular Army unit.

During World War II, the regiment was again deployed to Europe, where it provided artillery support for Allied troops during the Normandy landings, the Battle of the Bulge, and the liberation of Paris.

Today, the 21st Field Artillery Regiment is based at Fort Cavazos, Texas, and is equipped with the M109A6 Paladin howitzer.

A Gold color metal and enamel device 1+3⁄32 inches (2.8 cm) in height overall consisting of a shield blazoned: Argent a bend Gules, in base an eagle close of the last gorged with a collar Or bearing a Lorraine cross of the second.