"Looks like they're running out of fresh Jango.'" - Fi Skirata noting newer clones.
Clone Troopers are the soldiers of the Grand Army of the Republic during the Clone Wars. The obedient men are a genetic clones of the bounty hunter, Jango Fett. Towards the fall of the Jedi Order, the clones were less like Jango, as well as the earlier clones. The clones who had survived most of the war made up the 501st.