i don't really agree much on focusing resources in developing the marine corp.
there are still problems within the major services, having an effective marine is useless if the rest of the services can't keep up with the operational needs. there are limited airlift capabilities, limited naval superiority required to cover their back, even the best expedition force will crack under a week if it doesn't get supported.
i think they will hold on expanding it until they got the logistic and support capability to back them. a strong airforce and navy is far more important at this point of time.