Symbols of the UNSC
From Halopedia, the Halo wiki
The symbols of the UNSC are the symbols used to identify the organization and its branches.
The army's logo is composed of a chevron and triangle with a star in it.
Marine Corps logos
Spartan Operations logos
UNSC starships occasionally have their own symbols.
Halo: The Master Chief Collection
The ONI logo is a usable emblem and nameplate in the Master Chief Collection.
As part of the Halodays Season, a special nameplate for the MCC was added featuring the UNSC's Covenant War logo in a sweater.
Halo 5: Guardians