5600 Maryland Boulevard Aberdeen Proving Gro 21005 Phone: 410-278-9452 Type: Military 27 Holes Opened: 1954 Greens: Bent Grass Fairways: Bluegrass The Ruggles course 18 holes and the Exton course 9 holes offer memberships to active and retired military personnel, DoD civilian workers and contractors, family members and Harford County residents.