The MOPP concept arose from the need to balance individual protection with the threat, temperature, and urgency of the mission. In addition, commanders can exercise a mask-only option. Individuals must carry their protective mask with them at all times. Individuals wear their overgarment. They must carry the rest of their MOPP gear.
Individuals wear their overgarment and overboots and carry the mask with hood and gloves.
Individuals wear their overgarment, overboots, and mask with hood. They carry the gloves. Individuals wear all their MOPP gear.