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OSAN AIR BASE, South Korea (Nov. 5, 2015) - Elements of Bravo Battery, 2-1 Air Defense Artillery Battalion conduct Air and Missile Defense operations at Jungwon Air Base as Capt. Andrew Johnson, 35th Air Defense Artillery Brigade air defense artillery fire coordination officer, monitors air picture during the Vigilant Ace joint and combined exercise. The 35th ADA is the only permanently, forward-stationed Army ADA unit in the world.