Sam, or Samuel 034 is another child that is chosen to train as a Spartan. Sam is on John's original team when they first start training as children. Sam's hair is sandy blonde and he has green eyes. Sam is also one of the Spartans John chooses for their first real life mission.
Sam recovers the fastest of the Spartans from the side effects of the augmentation process. He is also the strongest of the Spartans. As adults, Sam is taller than John. Sam is shot on one of their missions and Kelly and John have to leave him behind. Sam's death is what convinces John that the Covenant is not invincible, but it did cost the Spartans Sam's life.