In terms of uniform regulations, which marking is NOT required?

Uniform regulations within the Marine Corps specify various marking requirements for different elements of the uniform. Undergarments, unlike outer garments, hats, and footwear, do not require specific markings to signify rank or branch affiliation. This is primarily because undergarments are not visible while in uniform and therefore do not play a role in the formal presentation of the Marine Corps uniform.

In contrast, items like hats, footwear, and outer garments often carry required insignia that identify the wearer’s rank and affiliation, contributing to uniformity and professionalism in appearance while representing the Marine Corps. Thus, undergarments alone are excluded from these marking requirements due to their concealed nature and lack of impact on the overall presentation of the uniform.