USGI NBC/MOP Chemical Protective Pants Desert Camo Size X-Large Long New. MSN: 8415-01-505-1567. GAS! GAS! GAS! These MOP gear pants are in New, unissued condition. Size Xlarge Long. Charcoal line to protect against chemical weapon exposure. Designed to fit over uniform. Includes pants and suspenders! Three color desert camo. Ships either USPS or UPS.