"We're just clones sir, we're meant to be expendable."
"Not to me."—Plo Koon and clone "Sinker"
Clone troopers, or clones, were what made up the majority of the Grand Army of the Republic. They were cloned from Jango Fett at the cloning facilities on Kamino. They all had control chips implanted while they were only embryos. These chips were said to make them more docile and protect against rogue Jedi, but they were actually for forcing the clones to comply with Order 66. One clone, Tup, had Order 66 activated early in him, leading to him killing a Jedi and repeating the line "Good soldiers follow orders," over and over. The clones were meant to be expendable, but not everyone perceived them that way.