US Navy (USN) Aviation Boatswain's Mate Third Class (AB3) John Njau (left) and Aviation Machinists Mate AIRMAN (ADAN) Mitchell Driver, both assigned to the Checkmates of Sea Control Squadron Two Two (VS-22), perform engine maintenance on a USN S-3B Vikings aircraft aboard The Nimitz Class: Aircraft Carrier, USS HARRY S. TRUMAN (CVN-75). The Truman is currently participating in the Joint Maritime Course, a Multinational North Atlantic Treaty Organization (NATO) exercise being held off the coast of Scotland