Take the SSA buy for instance, people are making a big deal out of 174,000 rounds. Well, they have 295 investigator/enforcement personnel, who have to serve warrants, etc. that's like 600rnds per person, not all that significant.
Look at DHS, there are 188,000 people in the department. 750 million rounds is basically a baseline training budget for roughly 300,000 weapons (2500 rounds per year), assuming 2-3 weapons in inventory per real enforcement/protection person, that means a tooth to tail ratio of about 1:2-3, pretty reasonable for a law enforcement / protection agency.