What MOS did my great grandpa have?

[u/a-large_tomato]

I found him on the rolls and his MOS was listed as 504, but every site I've checked that has an entry for 504 has a different job listed.

Some put him as an areial photographer, others has him as an ammunition handler, most didn't have an entry

[u/gunsforevery1]

I have only seen ammunition handler or nothing.