Stun rounds are the type of ammunition used by the UNSC during training of new recruits. They are non-lethal ammunition capable of causing minor injuries to the victim. This type of ammunition has been used in training for both SPARTAN-II and SPARTAN-III trainees.[1][2]


  1. Halo: The Fall of Reach - page 71
  2. Halo: Ghosts of Onyx - page 95
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