"In the US, we have seperate military services: Army, Navy, Air Force, and Coast Guard. The Marines are part of the Navy." Actually, the Navy is the Marine Corps' taxi service! ;-) Seriously, the Coast Guard is actually part of the Department of Homeland Security. During time of declaired war, there is a provision to bringing it under the Department of Defense.
U.S. warns governments, bankers Iran sanctions still in place (Reuters)
from the article: U.S. army chief: Iraq war has sapped ability to fight Iran