Police are not military though. They are not employed by the federal government. They are agents of the state. The military is meant for defending the country against external threats and not to be used against its people. That is what police are for. Same goes the other way around as LEOs are not sent off to fight on foreign soil.
There was a third amendment claim against police for forcefully quartering in some peoples homes and it was denied because police are not soldiers.
The relevant questions are thus whether municipal police should be considered soldiers, and whether the time they spent in the house could be considered quartering. To both questions, the answer must be no.
I hold that a municipal police officer is not a soldier for purposes of the Third Amendment. This squares with the purpose of the Third Amendment because this was not a military intrusion into a private home, and thus the intrusion is more effectively protected by the Fourth Amendment. Because I hold that municipal officers are not soldiers for the purposes of this question, I need not reach the question of whether the occupation at issue in this case constitutes quartering, though I suspect it would not. Furthermore, I need not address whether the Third Amendment rights allegedly violated were clearly established as of June 2011.