Why does this make the Marines surprised?

The Marine Corps is a sub component of the Navy. It per-se isn't a service. The Coast Guard is the most versatile service. They protect the Navy when in port, keep open our waterways, save peoples lives, perform law enforcement duties around the world, protect the environment, and keep the Marines safe. The Marines need the Air Force and Coast Guard "And" Army and Navy in order to survive from year to year.