Surgeon Lieutenant Nathaniel Roocroft of the Royal Navy demonstrates how to use a defibrillator during basic first aid familiarization training for Exercise Tradewinds 2017 in Bridgetown, Barbados, June 7, 2017. Tradewinds 2017 is a joint, combined exercise conducted in conjunction with partner nations to enhance the collective abilities of defense forces and constabularies to counter transnational organized crime, and to conduct humanitarian/disaster relief operations. (Royal Bahamas Defense Force photo by Marine Seaman Michael Turner/Released)