Japan Maritime Self-Defense Force aviators assist each other in boarding an inflatable raft during Winter Survival Training at Marine Corps Air Station Iwakuni, Japan, March 9-11, 2016. Mandatory for all aviators and aircrew, the JMSDF conducts this training semi-annually, once in the summer and once in the winter. The final portion consisted of drifting training where the aviators dressed in Taikan Taisui Fuku, a cold and water resistant suit. They jumped into the water, swam to inflatable-life-saving boats and worked as a team to climb aboard. (U.S. Marine Corps photo by Lance Cpl. Aaron Henson/Released) - Japan Maritime Self-Defense Force aviators assist each other in boarding an inflatable raft during Winter Survival Training at Marine Corps Air Station Iwakuni, Japan, March 9-11, 2016. Mandatory for all aviators and aircrew, the JMSDF conducts this training semi-annually, once in the summer and once in the winter. The final portion consisted of drifting training where the aviators dressed in Taikan Taisui Fuku, a cold and water resistant suit. They jumped into the water, swam to inflatable-life-saving boats and worked as a team to climb aboard. (U.S. Marine Corps photo by Lance Cpl. Aaron Henson/Released)