189th Field Artillery Regiment ( United States ) The 189th Field Artillery Regiment , today consists of 1st Battalion , 189th Field Artillery Regiment , and 2nd Battalion ( General Services ) Field Artillery Regiment which are headquartered in Oklahoma City , Oklahoma . It was a part of the 45th Infantry Division , Oklahoma Army National Guard . The Regiment only retains its affiliation with the Field Artillery branch for purposes of history and lineage and is the core cadre and leadership of the Oklahoma Regional Training Institute ( OKRTI ) . Its parent unit is the 90th Troop Command , a successor unit to the 45th Division . The 189th FA saw action during World War II and the Korean War as part of the 45th infantry Division . Deployments . WW II ; ( 45th Infantry Division ) Korea ; ( 45th Infantry Division ) History and lineage . The 189th Field Artillery Regiment began organizing in the early 1920s as a formation of the Oklahoma National Guard and was made organic to the 45th Infantry Division when it was organized . The 189th Field Artillery Regiment ( consisting of two battalions of 155mm howitzers - truck drawn ) was inducted into Federal service on 16 September 1940 and stationed at Fort Sill , Oklahoma . The 189th Field Artillery Regiment moved to Camp Barkeley , Texas on 6 March 1941 . On 11 February 1942 , the regiment split into two separate battalions , the 1st Battalion , 189th FA Regiment retained the number and remained with the 45th Division . The 2nd Battalion , 189th FA Regiment was redesignated as 202nd Field Artillery Regiment and was assigned to General Headquarters Reserve . The 202nd Field Artillery Regiment was further reorganized on 1 March 1943 when the 1st Battalion was redesignated as the independent 202nd Field Artillery Battalion and the 2nd Battalion became the 961st Field Artillery Battalion . The 189th served in Sicily , Italy , France , and Germany during WWII , receiving the Presidential Unit citation for action on the Salerno Beachhead . The 189th was recalled to active duty in 1950 with the 45th Infantry Division and served in Japan and Korea . The OKRTI today provides instruction in many areas , including , All Field Artillery courses , such as Field Artillery Military Occupational Specialty Qualification , Advanced Leaders Course , and Senior Leaders Course , Army Basic Instructor Course ( ABIC ) , Combatives Training , Health Care Specialist ( Combat Medic ) , Officer Candidate School ( OCS ) , Small Group Instructor Training Course ( SGITC ) , Platoon Trainer Qualification Course ( PTQC ) , Weapons of Mass Destruction ( WMD ) Training and a number of online distance learning offerings as well . Distinctive unit insignia . Description A Silver color metal and enamel device 1 5 / 32 inches ( 2 . 94 cm ) in height overall consisting of a shield blazoned : Gules , a bend Azure fimbriated Argent , in sinister chief an octagon of the like . Attached below the shield a Silver scroll inscribed " HONORIS CUSTOS " in Red letters . Symbolism The service of the former organization , the 189th Field Artillery , is indicated by the red shield . The bend represents Federal recognition , the silver fimbriation to separate the two colors , and the octagon suggests the Eighth Corps . Background The distinctive unit insignia was originally approved for the 189th Field Artillery , Oklahoma National Guard on 22 December 1925 . It was redesignated for the 189th Field Artillery Battalion , Oklahoma National Guard on 7 October 1942 . It was redesignated for the 189th Artillery , Oklahoma National Guard on 1 November 1960 . It was amended to change the description on 27 November 1964 . The insignia was redesignated for the 189th Field Artillery on 19 July 1972 . The insignia was redesignated for the 189th Regiment , Oklahoma Army National Guard , with description and symbolism revised on 29 April 1997 . = Campaign participation credit = World War II Korea