The Marine Corps is better positioned to deal with the China threat

Forbes:

The Marine Corps is gearing up to conduct combat exercises with its information warriors. Doesn't sound like the leathernecks of yore, does it? As America's military transitions from the global war on terror to great-power competition with near-peers like Russia and China, the Marines are rethinking what they need to deter or defeat in the future. One area where they need to bolster skills is protection of battlefield networks, because Russia and China are able to conduct cyber attacks and electronic warfare.

So the Marines are putting more emphasis on information operations in their preparations for combat, because if your communications are jammed or your intelligence data is corrupted in wartime, fighting effectively could be hard. The latest Marine Operating Concept (the Corps' plan for fighting and winning future wars) is heavily focused on securing and exploiting the electromagnetic spectrum.

Once you get beyond that innovation, though, what you find is a service returning to its roots: maneuver warfare, amphibious operations, "every Marine a rifleman." And with good reason. The operational environment of the future looks better suited to the agile, expeditionary strengths of the Marine Corps than it does to the ponderous, industrial-age traditions of the Army. The Marines have made rising China the pacing threat for their plans, while the Army is focused mainly on Russia in Europe. The White House cares more about China.

Because the Marine Corps and Navy are so much better prepared for combat in the Western Pacific than the Army and Air Force are -- at least, once you get away from the Korean Peninsula -- there is a case to be made that the Marines will dominate U.S. ground combat operations in the future. They certainly look poised to be called on more frequently than the Army for missions like crisis response and regional deterrence.
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There is more.  The story gives five reasons why the Marines are seen as the future of combat operations.

The Marines were a major combat arm in the Pacific During World War II and it appears they are resuming that role.  The Marines have a history of innovation that makes them ideal for taking on emerging threats.