While I do believe that Jade Helm 15 is just some massive military exercise, some of the things that the military has said does ring a bit odd.
1. This massive exercise is supposedly to mimic how the troops would function with local populaces in overseas environments.
Unless the U.S. were to invade, Canada, (excluding Quebec), England, the Rock of Gibraltor, the Faulkland Islands, Northern Ireland, New Zealand, and Australia, all other nations don't speak a great deal of english and thus they're not mimicking anything with that regard.
2. The footage of the exercise going on in Florida has the populace that agreed to be "detainees," shouting "I'm a soverign citizen."
This says to me that, yes....they are merely conducting a training exercise, however, that exercise is aimed squarely at the United States and its populace, not for any overseas activities.
Add to this, that Obama replaced Generals that would not agree to shoot at our citizens if ordered to do so. To me, that reminds me somewhat of what happened in Turkey. The pro-secular generals were accused by the government's new Islamist leader, of plotting to overthrow him and replaced by pro-Islamist military officers
So....are we seeing a trial run for federal martial law? I don't know. Only time will tell.