I learned the definition as 'Foreign Objects and Debris' when I was trained in the USAF in 2001, but I recently read an FAA document that used a different defin

I learned the definition as 'Foreign Objects and Debris' when I was trained in the USAF in 2001, but I recently read an FAA document that used a different definition. I'm not sure there is agreement on what this acronym actually stands for.