DA PAM 670-1: 21-9. Branch insignia
Quick Answer
General officers may optionally wear branch insignia for their position or duty assignment. All other officers wear the insignia of their basic branch (or detailed branch). Enlisted personnel wear the branch insignia of their PMOS. Exceptions include basic trainees (U.S. insignia only), Inspector General NCOs, and nominative CSMs/SGMs who wear senior enlisted leader collar insignia. See AR 670-1 for full authorization details.
Important
Unit and command policies may be more restrictive than AR 670-1. Always verify with your chain of command for local policies.
Official Source
View DA PAM 670-1, Section 21-9 (Page 210)Full Details
21-9. Branch insignia
See AR 670–1 for authorization to wear a type of branch insignia.
Related Figures

Figure 21-63: Regimental numbers attached to insignia
DA PAM 670-1, Page 210
Figure 21-63 from DA PAM 670-1
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Figure 21-64: Collar insignia, Acquisition Corps, enlisted only
DA PAM 670-1, Page 212
Figure 21-64 from DA PAM 670-1
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Disclaimer: This information is provided for educational purposes only. AR670.com is not an official U.S. Army resource. Always verify guidance with official publications and your chain of command.