PACIFIC OCEAN (July 20, 2012) The Royal New Zealand Navy fleet oiler HMNZS Endeavour (A11), center, refuels the Royal New Zealand Navy frigate HMNZS Te Kaha (F77), left, and the Republic of Korean destroyer ROKS Choi Young (DDH 981). Twenty-two nations, more than 40 ships and submarines, more than 200 aircraft and 25,000 personnel are participating in the biennial RIMPAC exercise from June 29 to Aug. 3, in and around the Hawaiian Islands. The world's largest international maritime exercise, RIMPAC provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2012 is the 23rd exercise in the series that began in 1971. (New Zealand Defence Force photo by LAC Amanda McErlich/Released) 120720-O-ZZ999-017 Join the conversation www.facebook.com/USNavy www.twitter.com/USNavy