@jim010:
page 13 states you can leave and come back in Combat Phase, but only if it is as an amphibious assault.
Movement is not then allowed in NCM if these units were moved in CM
“Once these sea units have moved and/or participated in combat, they can’t move or participate in the Noncombat Movement phase of the turn.”
This, right here.
Once moved, they’re done. You can either move them in Combat movement OR non-combat movement, not both.
Even the tank blitz does not allow you to move in both. A tank enters an empty enemy territory, captures it and continues its movement to the next territory all in the combat movement phase.