Halo Legends (2010)

S1E6 Prototype

A marine is dispatched to a remote planet with a mission to eliminate a prototype powered armor. However, upon his arrival, he discovers that humans still inhabit the planet, living under the oppressive rule of the Covenant. Realizing that the armor is the only hope for the survival of these people, the marine chooses to defy his orders and retains the suit, determined to use it to aid the oppressed inhabitants.