U.S. Air Force Master Sgt. Larry Nahalea, 351st Air Refueling Squadron boom operator, explains how to use an emergency passenger oxygen system to Spanish military firefighters, Oct. 23, 2015 at Son San Juan Air Base, Spain. The Spanish military members were given the opportunity to fly in the 100th Air Refueling Wing KC-135 Stratotanker to witness air refueling for Exercise Trident Juncture 2015. (U.S. Air Force photo by Senior Airman Christine Halan/Released)
<br>Unit: 100th Air Refueling Wing Public Affairs
Senior Airman Christine Halan
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