Since there is no evidence of a plan to commit a specific crime, the training is no different from teaching a group to use lock-pick tools. I don’t see a crime, at least not in the technical sense.
That’s why I was trying to say it depends upon the specific instruction of the training. However, training to involve the military in civilian matters could constitute an overt act that could then be considered conspiratorial.
Personally, I don’t get why a sheriff’s dept needs spec ops training of any type.