I say, it wouldn't hurt to be ready. Also Boofo is correct, though most of US' allies were made by bombing them, and then rebuilding. (Take Japan)
US really took control after WWI and WWII, Canada was a very powerful country it self, but now has out-dated fleets, and I think Canada should really not go to back up America, as we will really get our butts nuked

we have no protection.
This is no history lesson, but I'd say get ready, and if there is war I do not want to see any innocent people die in the US and allied countries, or even the enemies countries. They will have to take care of the enemy, and the enemy in this case is weapons of mass destructions, and maybe Sadam. They will only get one chance, but I do not know why Sadam would be crazy enough to test the US powers. Here is my analogy.
Sadam = Pawn
U.S & Britain = Foot Ball Team, each player weighing over 285 pounds, and taller than 6'3.
Again, I do not want to see innocent people die, but what must be done to insure the safty of the our nation, must be done, but may god have mercy on the innocent souls that will die in this war if it were to start.