Special Operations

SPARTAN Initative
The SPARTAN Programs are a series of UNSC projects designed to create physically, genetically, technologically, and mentally superior "supersoldiers" as a special fighting force within the UNSC Military.

The UNSC, in order to keep morale high, enforces the unreal concept that SPARTANs can't be killed. This is why all dead SPARTANs are listed MIA or WIA.