HeavyArty
The issue with the kneeling guy is that he is wearing the DBDUs and the rest are in MOPP suits. All soldiers wore the MOPP suits for the 100 hours of the ground war since the threat of chemical attack was high. They didn't go back down to just the DBDUs until after we had routed the Iraqis and they had left Kuwait. This was shortly after the cease-fire was declared on 28 FEB '91
Ummm, I don't want to complicate your decision making process Wing_nut, but this is not entirely accurate. Well, that isn't right either - Gino is probably correct when he says all soldiers wore MOPP suits for the whole 100 hours. However, that is not the case with the Marines and, as was pointed out already, this set could work if you wanted to depict Marines instead of soldiers.
So here is the deal - many, but not all Marine units were in MOPP gear during the offensive, at least for the first day or so. By the second and third day, when things had pretty much turned into a route, you began to see a transition where some guys were not wearing the MOPP gear, or at least not all of it - so for example, you might see a guy wearing the MOPP trousers but not the blouse (since the assumption was that it was easier to get into the blouse than the trousers).
To further complicate things, you have units like my own. We were in the amphibious task force off the coast. On day 1, we were prepare do land on Kuwaiti beaches, but because things moved so fast in the first hours, we landed in northern Saudi then, rather than move north along the coast, we punched inland. For the next three and a half days we chased the front, trying to catch up to the lead forces who were moving so fast.
During this time we did not wear any MOPP gear. We kept it close to hand, but didn't wear it. By the fourth day, when we reached 'the front', the cease fire had gone into effect. We got redeployed back along the Kuwaiti/Saudi border to clear areas that had been missed in the push north. During those days (about 10), we also never wore our MOPP gear.
Of course, this still present you with a tough decision to make, because you are not likely (although it is not entirely our of the realm of possibility) to find a fireteam in which some of the guys are wearing MOPP and others not.
As an alternative, you could also consider setting this scene in or around Khafji. I'm pretty sure that the Iraqis used Enigmas there. I also know that it was a bit chaotic and you could use that confusion to explain the disparity in MOPP gear.
Or, you could take the simple route, and leave out the guy who is not in MOPP gear... 