Why is it called ARC? I think this:
about the ARC, i dont think this was in reference to the ARC trooper, but rather the starfighter. The ARC(Agressive ReConnaissance)-170 was the predecessor to the T65 X-Wing jointly created by Incom and SubPro Corporations. This fighter was used in the later Clone Wars by the Republic Navy. Unique for its use of the S-Foil system(split wing like the x-wing), you notice it is used by the clone pilot squad(the one that follows obi-wan and anakin while they fly to Gen.Grievious' ship) during Star Wars Episode III: Revenge of the Sith, it's also used in this flash but i saw alot more than in ROTS so i came to the conclusion that the movie being named ARC was because of the widespread use of the ARC-170 starfighter during the space part of the battle.