Jacko asked
Have we made the mistake of retaining a 'first rate Army', scaled for these sizes of operation, but with a 'second rate Air Force' that's too small to do either?
Excuse the cynicism but I would answer yes. The American's don't need allies with high tech navies and airforces, the have those in abundance. What they do need are foreign troops on the ground incurring their share of casualties, the politically unacceptable face of war for those voters back at home.
As others have picked up, there doesn't seem to be any serious provision for the other scenarios outlined in the SDSR other than taking action within a US led coalition.