References: AR 670–1; paragraph 21–22; figs 21–139 and 21–140
a. Authorization
AR 670–1 authorizes insignia used to represent regimental affiliation to consist of either the RDI or DUI.
A Soldier’s regimental affiliation using an RDI is based on a Soldier’s branch, corps, or special branch as determined by PMOS or specialty.
A Soldier’s regimental affiliation using a DUI is based on a unit in which the Soldier is serving or previously successfully served.
Soldiers may wear the RDI for their affiliated regiment or may wear the DUI for a unit in which they are serving or have previously successfully served based off their assignment history as indicated in their personnel record.
b. How worn
References: paragraph 21–22; figs 21–139 and 21–140
The RDI or DUI, when worn as insignia to represent regimental affiliation, are worn as outlined in paragraph 21–22.
Soldiers (except chaplains, general officers, a CSM assigned as the SEAC, the SMA’s enlisted staff members) wear the DUI centered above the nameplate on the pullover sweater, with the top edge of the insignia 1/4 inch below the top edge of the patch on the sweater.
Soldiers assigned to units not authorized the DUI wear the RDI on the pullover sweater in the same manner as the DUI (see figs 21–139 and 21–140).
Chaplains wear their branch insignia, general officers wear the RDI, a CSM assigned as the SEAC wears the SEAC insignia, the SMA and enlisted staff members assigned to the office of the SMA wear the SMA insignia in the same manner.
All Soldiers may adjust the placement of the DUI or RDI up or down on the patch to allow for large DUI or RDI or to adjust to body configuration.