You're totally right of course and I think it's pretty shocking that military personnel aren't aware they are broadcasting their location out to the web. Complete opsec failure.
They are, they just don't care. The State Dept will likely issue a ban on their facilities which personnel will adhere to. Other military installations like Special Forces bases or regular Army bases overseas probably will issue a memorandum ("Be Vigilant!"), but I predict they won't stop using the devices. State Department facilities are the only places that they try to hide from others. Not that people and equipment are operating out of them (because that's impossible), but that they are State Department facilities to begin with.
