There were no MMA’s on my Naval Vessels so I can’t answer that; I was in charge of security on days/nights I was assigned duty on the watchbill so not really the same animal. 
The last Comercial vessel I worked on had ONE individual that had been to any SSO school, (it was not on his STCW Cert either, yet), and he wasn’t always on board when we were in Port AND there was no other SSO when he rotated home!:eek:
There are lots of other issues with this vessel, but that’s a story for another time!