U.S. Air Force Airman First Class Fabiola Estrada, center, from the 28th Logistics Squadron, Ellsworth Air Force Base, S.D., wipes a tear of happiness from her eye during a naturalization ceremony at Mount Rushmore National Memorial, S.D., Aug. 23, 2007. Seven of the Airmen taking this last step to become citizens of the United States are from Ellsworth Air Force Base, S.D. (U.S. Air Force photo/Staff Sgt. Michael B. Keller)