Can't play Firefight Matchmaking (not Because of absence of a HD)
Halo: Reach Firefight Mode Hands-On - GameSpot
This mode allows them to battle in multiple environments based on campaign maps, on foot or in vehicles, and against increasingly difficult waves of Covenant attackers. Firefight has no limit to the waves of enemies, and continues until the squad has completely run out of lives. There are five Waves in a Round and three Rounds in a Set. The Set, Round, and Wave can be seen at the top left side of the player's screen.
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