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NOVO SELO TRAINING AREA, Bulgaria – Sgt. Ruben Casiano, (right) checks to make sure that Spc. Felix Munoz’s MILES gear is working properly July 21, 2016 before the soldiers head out to the field for an 11-day training exercise. MILES gear is a Multiple Integrated Laser Engagement System that uses lasers and blank cartridges to simulate battle. 1st Combined Arms Battalion, 64th Armor Regiment is in Bulgaria in support of Operation Atlantic Resolve, a U.S. led effort in Eastern Europe that demonstrates U.S. commitment to the collective security of NATO and enduring peace and stability in the region.