@wandeljw,
From MPOV, the US courting of China has more to do with economics than military. I'm sure that in the event China attacks Japan, the US isn't going to be supporting China.
I see a time in the future when China overtakes the US economically; it's bound to happen, because China's population and educational system strips the US in every way. The only advantage the US now has over China in education is our university and colleges, but China has the potential to top that in a few decades.
We just have to get used to the idea that our five percent of the world population isn't going to be the economic and military superpower forever.