Rear Admiral refers to two separate senior commissioned officer ranks of the UNSC Navy:

• Rear Admiral (Upper Half), equal in rank to Major General in the UNSC Army and UNSC Marine Corps.
• Rear Admiral (Lower Half), equal in rank to Brigadier General in the UNSC Army and UNSC Marine Corps.

Rear Admiral may also refer to a multiplayer commendation in Halo: Reach:

• Rear Admiral (commendation)

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