Halo Legends

A ODST team led by Sergeant Major Cortez and composed of Taylor Myles, Checkman, and O'Brien is sent to assassinate a Prophet on Heian. However, the sniper, O'Brien, is stripped of his assignment in favor of a Spartan, Cal-141. Checkman dies upon atmospheric reentry, crashing into an asteroid, and O'Brien falls into a swamp, but is saved by Cal. The team sets out and finds the remains of an unknown alien race, photographing them as ordered, and continues. On the way, they encounter some Grunts. After exterminating them, however, a Brute Army Commander appears out of nowhere and attacks O'Brien. Cal seemingly kills the Brute and saves O'Brien again. The team reaches a perfect location to assassinate the Prophet, but the Brute, who has somehow survived, attacks from behind, targeting O'Brien. Cal tries to save him but is hit. The ODSTs kill the Brute, and O'Brien manages to shoot the prophet instead of Cal, who dies shortly thereafter. Once back at base, the ODSTs nearly beat up a marine who mocks the Spartan's death.