180416-N-CL027-0019 YOKOSUKA, Japan (April 16, 2018) Sailors patch a simulated pipe leak aboard the aircraft carrier USS Ronald Reagan (CVN 76) during a crew certification by Afloat Training Group Western Pacific. Crew certification is a five-day process where inspectors ensure a ship is ready to safely operate at sea with a trained and qualified crew. (U.S. Navy photo by Mass Communication Specialist 2nd Class Janweb B. Lagazo/Released)