CC-1138 has so many hypothetical “merit badges” under his belt things it’s staggering. To begin with he directly trained under a former Mandalorian Journeyman Protector, who was part of the Cur’val Dar, which is awesome. And then he trained up Alpha-17 in his Arc officer training program and is one of only 4 Graduates to go on to attain the highest possible rank for a Clone Trooper: Marshal Commander. Not to mention his division, the 21st nova corps, has basically the hardest selection process outside the GAR special operations groups. It also seems that other divisions in the grand army have also had units go through training with the Galactic Marines like Mace Windu’s Marine division in his 187th Legion. And it seems like most of his corps reports directly to him instead of having other commanders taking small parts of his unit and going on separate missions, Keller is the only officer I know of in the nova corps and the only other division we’ve ever seen, everyone else is just the Galactic Marines which puts easily thousands of Clones under Bacara’s command. And again he’s one of only 4 clones to achieve the title of Advanced Recon Clone Marshal Commander.