It is no longer obvious, as it was only a few years ago, what the Army is for anymore. This is not some sort of metaphysical question. As Andrew Krepinevich, director of the Center for Strategic and Budgetary Assessments says, “In the Cold War, the Army was the supported force, not the supporting force. The same was true in Afghanistan and Iraq.” The Navy’s job over the last decade was mostly to haul fighter planes around on top of aircraft carriers. But all that has been reversed.

http://www.foreignpolicy.com/articles/2012/01/26/panetta_obama_defense_cuts_pentagon