As a former NBC NCO, I gotta fight ignorance on this one. It is such a well told story, it may as well be one of the UL’s of the Army. First off, units do not camp out in chemically contaminated areas. The mission is to usually avoid the area altogether. If that is not possible, the unit will move through the area as quickly as possible. Generally, leadership will communicate to higher levels to determine when the unit is beyond the contaminated area, and then move further along just to be sure. S2 would be consulted to determine if the area is clear of chemical weapons. Maybe S2 does not know for sure. That is when your chemical defense team would take readings. (When I say chemical defense team, that may be your NBC NCO and the NBC OIC, or just the person trained in NBC defense.) If your company level NBC guy was absent on this mission, Common Task Training teaches all enlisted Soldiers, and presumably all Officers how to test for the presence of chemical weapons in the area. Break out a test kit, and check.
All of your Soldiers forgot to pack the test kits along with their protective equipment? Well first, you need to fault your NCO’s for not doing Pre-Combat Checks. Then you again consult with S2 and ensure the area is clear. Move until birds are flying and crickets chirping. Move until you see a squirrel climbing the tree your are resting against.
Then when you can presume the area is clear, you would have the least mission essential person take a deep breath, break the seal of his mask, and open his eyes for no more than 10 seconds. Have the provided chemical defense injections at the ready. Regardless of what you may have heard, disarming the person who will break the seal of the mask is not mentioned in the FM. If there is a chemical agent in the area, the eyes will react quickly. The Soldier will be taken out of direct sunlight and will be monitored for 10 minutes. If no reaction, a second Soldier may be told to break the seal of his mask and open his eyes.
Wait ten minutes, no reaction from the second Soldier, the first Soldier may break the seal of his mask and take a breath. Again have the defense injectors at the ready. Move the person to a shady area, and wait ten minutes. At this time the second Soldier will be instructed to break the seal and take a breath. If no reaction, the “All Clear” may be given.
I just wanted to clarify so it wouldn’t seem as though CO’s would wander through a chemically contaminated area and say, “PVT Johnson, I think this is safe, take your mask off.
PVT Johnson appears to be doing the kickin’ chicken’ well lets move 20 feet to the north, 2LT Smith, take your mask off and breathe” Repeat as needed.
SSG Schwartz
ETA: The Soldiers would have been instructed to decontaminate themselves and all their equipment before the first Soldier would be told to break the seal, lest there be some chemical agent present on the equipment that could cause harm. This process could take hours and trust me, being in full chemical defense equipment for hours will make the heartiest NCO want to volunteer to break the seal.