Siblings Army Sgt. William "Trey" Bullock III (left) and Senior Airman Mary Bullock (right) say their grandfather, a World War II veteran, was their greatest influence growing up. Sgt. Bullock followed in his footsteps by becoming an Army Ranger. Inspired by both her grandfather and her younger brother, Airman Bullock joined the Air Force. Today, the brother and sister duo sometimes find themselves working together despite being in different services. (U.S. Air Force photo/Senior Master Sgt. Terry Blevins)