The Naval Update Map shows the approximate current locations of U.S. Carrier Strike Groups (CSGs) and Amphibious Ready Groups (ARGs), based on available open-source information. No classified or operationally sensitive information is included in this weekly update. CSGs and ARGs are the keys to U.S. dominance over the world's oceans. A CSG is centered on an aircraft carrier and includes significant offensive strike capability. An ARG is centered on three amphibious warfare ships, with a Marine Expeditionary Unit embarked. Carrier Strike Groups CVN 72: The USS Abraham Lincoln is underway in the Philippine Sea. CVN 75: The USS Harry S. Truman is underway in the Mediterranean Ocean. CVN 76: The USS Ronald Reagan is underway in the Pacific Ocean. CVN 77: The George H.W. Bush is underway in the Atlantic Ocean for a Composite Training Unit Exercise (COMPTUEX).