General Franks was commissioned a second lieutenant in 1967 as a distinguished graduate of the Artillery Officer Candidate School, Fort Sill, Oklahoma. After an initial tour as a battery Assistant Executive Officer at Fort Sill, he was assigned to the 9th Infantry Division, Republic of Vietnam, where he served as Forward Observer, Aerial Observer, and Assistant S-3 with 2nd Battalion, 4th Field Artillery. He also served as Fire Support Officer with 5th Battalion (mechanized), 60th Infantry during this tour.

Looks like he got it as an artillery AO-)
BT
In any case they are wings to be proud of-)