What was Tim Walz’ MOS in the Army?

I’ve been trying to find this out, since I’ve seen a lot of conflicting claims about his MOS in the army national guard. I’ve seen some that say he was an infantrymen, a cannon crewmember, and even a human resources specialist.

I don’t really care, and don’t want to be political and make accusations against his military service, but just want to know what exactly he did in the Army other then being a Sergeant Major.