Yes I am Captian Obtuse.
Do you mean the threat of radical Islam O' wise and cryptic one? :)
Partially.
Troop numbers are significant. Right now we are on Iran's east and west flanks isolating them. That's important, but it's not the only thing.
If a large enough number of Reserve or NG soldiers are placed on our southern border, do you think China will fail to take notice and then snatch Taiwan?
Afghanistan also borders China.