120mm, after the assignment gods have selected you for QM (for reasons known only to them) and you've spent the required time in grade and made it through selection to CPT, you now have the opportunity to ask the army to put you into SF, CA, MISO (formerly PSYOP), and FAO where you have a good chance of (1)getting the kind of job you want and (2) using the language - or another foreign tongue

Cheers

JohnT