What is the Marine Corps order for uniform regulations?

The Marine Corps Order that outlines uniform regulations is MCO P1020.34D. This order provides comprehensive guidelines regarding the proper wear and appearance of Marine Corps uniforms, detailing specifics like the types of uniforms authorized, embellishments, and maintenance standards. It serves as an essential reference for all Marines to ensure uniformity and adherence to traditions of military dress, thereby fostering a sense of pride and professionalism within the ranks. The other options pertain to different areas of Marine Corps operations and regulations, such as training and safety, but do not specifically address uniform standards.