We're partners. I have done training exercises on 6-7 US bases, about half of those inter-operating with them, and we're side by side overseas with overlapping support capabilities.
For example, there might be a joint operation planned in side by side towns that Canadian artillery guns support from the ground and US attack helicopters support from the air.
Yes we share bases overseas, but with dozens more countries. Use Wiki to find "KAF".
It's too vague to describe what it's like to work with the entire US military. Your experience may be different on an Army logistics base vs a USMC recruit base vs a TopGun school vs a Navy carrier group.