"A U.S. Army soldier with the 10th Special Forces Group...

...and his military working dog jump off the ramp of a CH-47 Chinook helicopter from the 160th Special Operations Aviation Regiment during water training over the Gulf of Mexico as part of exercise Emerald Warrior 2011 in this U.S. military handout image from March 1, 2011."

REUTERS/Manuel J. Martinez/U.S. Air Force