The Federal buys are making it difficult for State and local law enforcement to acquire ammo.
Since the general public is 3rd in line, this has a long term effect of drying up supply.
They are unaware of the number of folks who've planned ahead.
I'm also not worried about the Fed's training a bunch of desk jockeys, to act as some brown shirt squad.
Training is definitely a component, though. That DHS contract for 7000 "Personal Defense Weapons" has a training clause in the statement of work, even including several "cutaway" examples of the firearms to be used by instructors.
I believe the military uses similar things during basic training.