It's ridiculous for the mayor to be doing this. Where there is crime, policing is needed. Cities that have tried to cut back in the past (the impetus usually being budget) usually end up with problems, and it usually doesn't work out.
The number of 911 calls is rising rapidly.
Surely, there's an opportunity to 'not buy big surplus toys from the Army' but I suggest that this is not a hugely meaningful budget line item.
The problem in America is absolutely not 'over-policing', it's that police are asked to play more roles many of which they might not be suited to, and of course, some police are far too aggressive, which is also driven by the great prevalence of guns in the population.