Several KC-135 in the middle of the night over the US

https://preview.redd.it/1qzi1nhtoslg1.png?width=1480&format=png&auto=webp&s=2682d0c28cf570ea3f931ae6ef206ff2ee8c84b4

Four from Salt Lake, flying in pairs, plus this other two. Anybody any idea why? Not sure if related to current geopolitics, so I post this here.