My Great-Great Grandfather was in the Army, but there's no record of what he did specifically.
My Great-Grandfather was a B-24 pilot during WWII. He got shot down and captured, and was a POW for about 2 years.
My Grandfather was also in the Airforce, but he never flew a plane.
My Dad was in the Navy on the USS Saratoga, and he did work on the A-6 intruder for the Black Panthers squadron.
It's kind of a tradition for the men in the family to join the Armed Forces. I know there's more but like my Great-Great Grandfather there's little or no record of them.