I think it was on a recent Q thread, someone posted two articles and links (which I meant to save), the military decided NOT to use Amazon’s cloud. Maybe Steven W. posted or knows?
I looked at this: http://www.nextgov.com/it-modernization/2018/03/defense-agency-begin-moving-classified-data-amazons-secret-cloud-after-protest/146619/
Last k saw last night was that they were