Spanish military firefighters, center, view the KC-135 Stratotanker, Oct. 23, 2015, at Son San Juan Air Base, Spain. The firefighters were given the opportunity to fly aboard the tanker to witness air refueling conducted by the 100th Air Refueling Wing as part of Exercise Trident Juncture 2015. The 100th ARW worked closely alongside German and Spanish military counterparts during the exercise. (U.S. Air Force photo by Senior Airman Christine Halan/Released)