Stun round

Stun rounds are non-lethal ammunition used by the UNSC in training exercises. They were used on SPARTAN-II, SPARTAN-III, and SPARTAN-IV trainees.

While the tactical training rounds typically used in the training of normal infantry are sometimes also called stun rounds, the stun ammunition used in the Spartans' training are a distinct type of round, being rubber bullets which numb the targets they hit by the sheer force of the impact alone rather than an anesthetic in the case of the TTR round. Meanwhile, the rounds used in the training of the SPARTAN-IVs seemingly inflicted a powerful electric shock on their targets upon impact.