This is SF street grade BS. There are NATO HQs established in the territory of many NATO members. SHAPE in Mons, CINCIBERLANT outside Lisbon Portugal, etc. They are all tenants of the host country.
Not to mention that the number of NATO and other foreign national service members in the US at any one time is tiny compared the the size of the US military, not to mention the US population.
They are literally not capable of being a threat, even if they wanted to be one.
There is a distressingly large amount conspiracy mongering on this site recently. It takes away from dealing with real problems and threats.
A weak and delusional national leadership, a Red Chinese leader who thinks he is Mao 2.0, and allowing savages to take over Afghanistan are bad enough without conjuring up bogeymen.