"...the Marine Corps Staff Sergeant indicated by the four gold chevrons on his filthy dress coat's sleeve."
This lead some to believe that UNSC Marine insignia was identical to that of the United States Marine Corps, a reasonable assumption, considering that they share the same ranks and organization. However, with no other information, the insignia could just as likely be the same as a British Royal Marines Colour Sergeant (Check the page for Royal Navy ratings rank insignia. It's there).
Halo 3: Recon Screenshot - Upper right chest plate has sign of one chevron and two crossed rifles
Is this proof of UNSC and US Marine insignia being identical? Your comments, please.