By this, I would interpret commanders with high naval and (particularly for the admirals) aggression ratings. They tend to go out of their way to pick a fight and it shows with multiple engagements.
Why Admirals - I thought rank made no difference?
Chickenboy referred to command level I think (single ship / TF), not actual rank. You are right rank makes no difference.
Yes, I was referring to TF commander. Usually, for most of the best qualified Air Combat commanders, it's some degree of Admiral. If you can find a good Ensign with good leadership, naval, air and aggression, use them instead. Usually, though, the better ones are higher rank for TF commanders.
Does the rank of a TF commander matter? Sometimes the commander is denoted with a * (or a #?) when it is auto-picked (somewhere else on this formus is explained the way the a.i. picks the commanding captain of a TF automatically).
When hand-picking a commander (mostly of higher rank) the * disappears.
I wonder if there is some sort of leader modifier (-) in combat if you dont have a commander of the right rank. Eg small (taskforces a rear admiral, the bigger ons a vice admiral etc.). In land combat there seems to be, if a unit is fragmented and has a automatically assigned leader of a lower rank leading the battle.
(miostly happens when invading and not unloading the unit in one turn).