Yes, this sort of training has been done many times in the past. This day and age is a bit different in that folks are so distrustful of the government because of attempted gun bans through “Fast/Furious”, multiple federal agencies purchasing ammo in such a way as to cause panic/price increases, shortages. Then there is all the gubbamint spying on citizens Internet/credit card purchases/phone traffic, operation choke point, fomenting race riots, equipping local law enforcement with military vehicles/hardware...the list goes on.
Such a volatile time in America. If it's not some sort of “message” to American citizens, then it really appears to be poor judgment at the very least.