

Pilot-issue versions of these vacuum suits were used by the FSS-1000 Sabre crews who boarded the Covenant corvette Ardent Prayer during Operation: UPPER CUT. These suits possess no EVA thrusters by default, but are compatible with EVA gear integration. The variant worn by UNSC pilots is minimally armored, while the A/X combat suit used by Marines features heavy armor plating. Though identical in outward appearance to regular combat BDUs, these suits incorporate a fully pressurized body suit and a vacuum-rated ECH252 combat helmet. The vacuum suits generally used by UNSC pilots and infantry during space operations are based upon the universal BDUs used by the UNSC Marines, Army and the Air Force.

The UNSC utilizes several types of vacuum suits.
