Latest trailer from IW, most of you have seen it already. For reference...
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From about 1:06-1:26 we see soldiers moving about a basement type area. Why are some of them holding their heads and acting strange? It shows one of them performing CPR so maybe it is just an OP.
could be a toxic gas attack,
shells are hitting, so they could be going into shock, the explosions and change in air pressure can make them feel light headed[?], it could be acoustic weapons as well. [weapons that make sounds that can completely disable a person]
I think that some kind of dity nuke has gone off in Washington D.C. similar (Spoilers AHEAD) to the one that went off half way through the first Modern Wafare, this is why most of the soldiers seem to to be suffering from shellshock and Washington D.C. is in flames