Wing of Mercy looks at the Search and Rescue service of the US Coastguard, the seventh largest Naval air force in the world, and its Aerospatiale HH-65a Dolphin helicopter. This helicopter is at the forefront of the coastguard's 70,000 rescue missions a year and has been in service since 1983, covering over 15 different locations and over 15,000 miles of US coastlines. Seawings Productions Inc. co-production with The Discovery Channel