Why Does Captain Rex have a different Clone Trooper helmet to the rest of the 501st Legion in the Clone Wars Season 7 Episode 12? The Clone Wars Episode 12 shows us why Captain Rex combined Phase 1 Clone Armor with Phase 2 armor, to create the most unique armor of any Clone Trooper in the Grand Army of the Republic. Captain Rex armor Phase 2 and Captain Rex Armor phase 1! Finally, why is Captain Rex’s helmet different? He is led by Jedi General Anakin Skywalker in the 501st legion! Siege of Mandalore Part 4! Finale.