The 400 rounds per employee might sound reasonable at first but then when you consider that many if not most DHS employees are in support roles such as secretaries, janitors, mailroom clerks, and who knows how many other categores, the number per armed employee goes up drastically.
Secondly, is it necessary to fire hollow points at the practice range? What are the targets made of? Kevlar? What's wrong with good old cardboard?
As for why hollow points, why not train with your duty ammo when you can get someone else to foot the bill? Have you ever heard of a government entity spending other people's money wisely?
Many of the CCW classes around here require a 200 round qualification. 1,000 practice rounds a year per person would be easy to attain, especially if they were free.