My original thought in posting this thread was to explore how Aikido might be suited to police and military work since you have a range of hard and soft techniques to choose from.
Now I'm even more convinced after reading what Ledyard Sensei wrote. Especially given that the police are occasionally captured on video using excessive force, which might be avoided with more training in correctly discerning the threat level and responding appropriately.
And Aikido teaches lots of counters to the specific attacks Kit mentioned in the ASLET and Calibre studies that would help professionals stay in control of those level II and III situations.
Check out the Koga Institute and Robert Koga. He was the first person in the US to teach an Aikido based Defensive tactics system to the police. He was the trainer for the LAPD way back in the day.