That would be the clones with the rank of Commander, such as Gree, Cody, Appo, Neyo, Baraca, Wolffe, etc, to name some of them off the top of my head. Followed by Captains, like Rex and a few others. The Commanders report directly to their individual Jedi Generals with a few exceptions like Rex who is a Captain but reported to and served directly under Anakin while Appo was the actual 501st Legion Clone Commander (as of RotS).