https://psmag.com/social-justice/militarization-of-police-does-not-reduce-crime
Because I don't know anything about the Pacific Standard as a source, here is a link to the study
http://www.pnas.org/content/early/2018/08/14/1805161115
One of the conclusions of the study:
Perhaps most importantly, he reports "there is no evidence that acquiring a SWAT team lowers crime, or promotes officer safety." All in all, he adds, "the benefits of increased deployments appear to be either small or nonexistent."