Learn where the snipers are and kill them. Halo 2's snipers are bull**** and have been like that since it came out. Just like grenades they are always a 1 shot even if every other enemy in the game can take a lot more shots. Master Chief is just super weak.
Please use the update notification system to report a game patch, update or to report that the trainer may not be working with the latest version of the game. If 3 or more reports have been filed, consider BOOSTING the priority of this title for a faster turnaround on the updated trainer.
Please put that info into your report, thanx.