The newspaper reports units taking part in the training include 1st Battalion, 75th Ranger Regiment at Hunter Army Airfield, the 160th Special Operations Aviation Regiment from Fort Campbell, Clarksville, Ky., and the Air Force Special Operations Command from Hurlburt Field in Mary Esther, Fla. Officials say helicopters and fixed wing aircraft will be used, along with training ammunition and other devices aimed at making the exercise as realistic as possible.