To all New Yorkers: You are currently NOT ENTITLED to see the methods and techniques taught at the NYPD academy.
Requests are being denied on these grounds: "Deniable records include records or portions thereof that: (e) are compiled for law enforcement purposes and which if disclosed would: iv. reveal criminal investigative techniques or procedures, except routine techniques and procedures;"
Police deal with violent criminals who have no regard for police life; in fact often they are explicitly against police. They're going to learn techniques appropriate for dealing with such people. Some of those techniques will be violent and resemble "military" tactics, but that's only because the military also deals with violent adversaries.
[0] https://www.statista.com/chart/5211/us-citizens-killed-by-po...
In other countries like England & Wales, when a police officer seriously injures or kills someone, there's a formal investigation by the Independent Office for Police Conduct, an independent body at a centralised Government level with powers equivalent to a police officer for matters they investigate. They also usually provide public reports, for example, https://policeconduct.gov.uk/recommendations/police-response.... (Also note the limited use of force - two shots, one of which struck - and immediate care.) It's still not perfect, but it's a heck of a lot better than what the US does.
All officer involved shootings are investigated, but you take issue with the investigation being internal. If an independent investigation office was created, would you accept the results if the results still were the same? What group, would you accept results from in independent office from as not compromised or part of a pro-police conspiracy? Certainly not any Trump appointed office, no matter how seemingly neutral.