Works out to 400 troops per state. That's not much.
3rd amendment only forbids forcing citizens to take in soldiers stationed in their area.
According to posts in the past these are primarily "Specialist Troops" (Medical, NBC, Logistics etc) less than 5,000 are infantry, they are not even enough to provide security to the others.
This will give uniformity and better emergency response capability to to state and local agencies that have demonstrated a marked lack of professionalism in the past.