In a combat against 13 ships I had this report:
Boarding assault
BB_Voyager maneuvers into boarding range first.
BB_Voyager sending 120% fatigued Marines Assault Unit MK MD to find a boarding spot.
The boarding party found an area and sabotaged it, doing 0 damage!
Once a MAU reach 90% fatigue, its power is 0 and it should not be include in the remaining of the battle.
I think Sir Emi is looking at this issue as posted in another thread Mata.
http://forum.astro-galaxy.com/index.php/topic,8704.15.html page [2]
Hopefully it will be fixed soon, for those who rely on marine power anyway.