Highland Industrial Park, a storage and testing facility for Defense Department contractors in East Camden, is in Calhoun and Ouachita counties. The 17,000-acre park contains 600 munitions storage bunkers. Used for testing and storing Navy ammunitions during World War II, much of the former depot now functions as the Highland Industrial Park, where several Defense Department contractors store munitions and conduct tests.
https://en.wikipedia.org/wiki/Shumaker_Naval_Ammunition_Depot
