Apparently the US Department of DefenseWar thinks that they can order non-US citizens not resident in the USA to cease and desist from mailing things.
Uh…
Hilarity of the items involved aside, the gall of the US military postal service to give orders to civilians not under their command and not even of their nation is shocking.
To add to this, lots of companies ship exclusively with UPS and FedEx, neither of which can deliver to APOs.