Members of the 2nd Battalion Princess Patricia's Canadian Light Infantry from Shilo, Manitoba, and 1st Battalion, 3rd Marine Regiment, practice the Fast Rope Insertion Extraction System with a CH-53E Super Stallion helicopter, at Marine Corps Air Station Kaneohe Bay, Hawaii. Twenty-two nations, more than 40 ships and submarines, more than 200 aircraft and 25,000 personnel are participating in the biennial Rim of the Pacific (RIMPAC) exercise from June 29 to Aug. 3, in and around the Hawaiian Islands. RIMPAC 2012 is the 23rd exercise in the series that began in 1971. Canadian Forces photo by Master Cpl. Marc-Andre Gaudreault.