Marines with 4th Light Armored Reconnaissance Battalion, 4th Marine Division, run through dry fire drills during exercise Trident Juncture 2015 in Almeria, Spain, Oct. 27, 2015. The drills allow Reserve Marines to train in realistic environments and maintain a high state of readiness. More than 36,000 troops from more than 30 nations are participating in the exercise which is the largest NATO has conducted in the past 10 years.