He asks: "who is the true adversary such a large and expensive (at a time when money is really tight in the Army) exercise is being gamed against."
The answer is put forth in the 2010 DHS redefinition of what "terrorist" and "insurgent" truly is, documented multiple times here on FR: anyone who opposes The Won.
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Someone needs to get pictures. Truth is that train cars are NOT going to be sent to the ME for any type of battle. So fitting out train cars makes no sense within the context of foreign wars.