Halo 4

From: Maxx_the_Slash | #010
Master Chief is the highest rank for Marine forces, and it's also literally a one-of-a-kind rank that no one else has. Who would give that up?

Also, the actual rank was created especially for him, and no other Spartan from any of the 4 Spartan programs came close to deserving it. If the Chief dies, the rank dies.

Actually it is a Naval rank, not Marine. It also wasn't made especially for him. ONI (Office of Naval Intelligence) are the ones responsible for the Spartan program.
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Playing: Chivalry: Medieval Warfare, AC 3, Halo 4
Anticipating: Hitman: Absolution, Gears of War: Judgement, GoW: Ascension