Āhua 31 - Pirihimana Pirihimana
Ko te Ope Taua me te Marine Corps te karanga i to raatau tohu mahi, "MOS," ranei "Nga Mahi Whakanui Mo Nga Mahi Hauora.
Kei raro nei nga MOS o te Ope Taua e taka ki roto i te Ture Whakanuia Ture :
31B - Pirihimana Pirihimana
31D - Kaitohutohu Motuhake Kaute (CID)
31E - Kaihautū Tohu / Whakanohonoho
31K - Kaihautunu Mahi Mahi