http://www.thefreedictionary.com/civilian
Please stop playing word games. Non-military is one way to use the word. In that use, police are civilians. When speaking of police and non-police, non-police are civilians. Get over that reality. Moving on from that particular silly diversion.
The Third Amendment:
The Third Amendment was written because King George was forcing colonists to house, feed, and otherwise care for the soldiers he was using to make war upon them. It is specifically referring to
soldiers and to their being
quartered in people's homes. It does not address police commandeering homes for operations.
Make no mistake, I do not condone such a taking as the titular incident. It is just not necessary that we use the 3A to argue against it. That makes us look fringe. It is a violation of the 4A, and that is all that matters.
Again, if someone comes up with a court case that held that police commandeering a house for an operation was covered by the 3A, post it.