181114-N-OA516-0050 OSLO, Norway (Nov. 14, 2018) Capt. Joseph O’Brien, commanding officer of the Wasp-class amphibious assault ship USS Iwo Jima (LHD 7), signs the guest book at the Oslo Harbour, Nov. 14, 2018. Iwo Jima is currently in port after participating in exercise Trident Juncture 2018, which was a NATO-led exercise designed to certify NATO response forces and develop interoperability among participating NATO allied and partner nations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kevin Leitner/Released)