So can a Orca equipped SCUBA (Mech) Platoon be advisable?
Aquamen! The elite infantry of the merfolk!
It is, however, a problem, as only conventional foot infantry types can use K9s, and with orcas, you have yourself a beast-mounted submersible naval platoon there. Mechanized, jump, or other non-foot troops are not valid K9 unit choices as it's too easy for the li'l beasties to become separated from their masters in the heat of battle. (We may have left the wording vague enough somewhere to "treat beast mounts as foot infantry" somewhere, though. But such does not appear to be in the rulebooks I have on hand.)
- Herb