U.S. Navy Petty Officer 2nd Class Fitzroy Hall uses an autorefractor machine during an eye examination at a medical civic assistance program at the Prince Ngu Hospital in Neiafu, Vava'u, Tonga, on April 14, 2011. Pacific Partnership is an exercise designed to strengthen alliances, improve U.S. and partner capacity to deliver humanitarian assistance and disaster relief and improve security cooperation among partner nations.