Omega Squad is a squad of clone commandos that is featured in ever Republic Commando novel and Imperial Commando: 501st (just disbanded). Omega Squad originally wore plain white armor, but then upgraded to black stealth armor due to request from Darman.
The squad was heavily influenced by Kal Skirata, as he was their training sergeant and taught them the Mandalorian ways. He accompanied them on many of their operations as well. Other than Skirata, they took orders from General Zey.