With all the talk of Britian and / or Isreal being bantered about here, I would like
to put in a little plug for Canada as being the true "best" ally of the U.S.

We are your biggest (by a large margin over the next in line) economic trading partner.

We are co-partners in NORAD. In fact, it was a Canadian General at duty stations in NORAD,
who was the one who ordered all domestic air-traffic halted on 9/11.

We have a proud tradition of shared military history with your country.
In fact, 2 of our head military leaders have served as commanders in the U.S. Army

General Rick Hillier
Former Chief of Defense Staff for the Canadian Armed Forces, military leader of the Canadian
Armed Forces (similar to being the Chairman of the Joint Chiefs of Staff at the Pentagon)

First ever Canadian Deputy Commanding General III Corps U.S. Army at Fort Hood Texas

General Walter Natynczyk Present Chief of Defense Staff for the Canadian Armed Forces
Graduate of the US Army War College.
Deputy Commanding General III Corps at Fort Hood Texas, deployed with the III Corps to Baghdad (2004).
Served as the Deputy Director of Strategy, Policy and Plans, as the Deputy Commanding General of the
Multi-National Corps (Iraq) and as commander of the III Corps 35,000 soldiers (consisting of 10 separate
brigades) stationed throughout the Iraq Theatre of Operations.

I would think that when it comes to your military allies throughout the world,
you only need to take a look at your neighbors to the north to see true friends.