[1] The regiment was broken up on 11 February 1942 and its elements reorganized and redesignated as follows: The 158th Field Artillery Battalion was inactivated on 24 November 1945 at Camp Bowie, Texas.

The 158th Field Artillery Battalion [NGUS] was organized and federally recognized in its stead on 3 November 1952 with Headquarters at Chickasha.

The 1st Battalion was ordered into active Federal service on 19 August 2008 at home stations, and released from active Federal service on 22 September 2009 and reverted to state control; on 1 September 2008, the regiment was reorganized to consist of the 1st Battalion, an element of the 45th Infantry Brigade Combat Team.

[2] A Gold color metal and enamel device 1+1⁄4 inches (3.2 cm) in height consisting of the shield, crest and motto of the coat of arms.

The three broad arrowheads represent the recognition awarded the organization for service in Sicily, Naples and Southern France.

The green wedge symbolizes mountainous Italy, and the fleur-de-lis is for French and Central European service.