( Editor's Note: Army Col. Mark Elfendahl's rank, initially misstated, has been corrected.) The U.S. armed services must achieve unprecedented synergy to ensure access to contested waters, skies, land, space and networks in the face of emerging weapons, the military's top officer warns in a new high-level document. Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey's admonition comes in the Defense Department's new Joint Operational Access Concept, which names no adversary but focuses on "anti-access" and "area-denial"...