Grayson MacMillan

Grayson MacMillan was a former "child soldier" of the Insurrection who was born in the closing days of the Human-Covenant War, and somehow managed to survive until the age of 20. Realizing he'd been off to a wrong start, Grayson packed his things and decided to put his skills - namely, explosives and fighting - to the test, starting work as a mercenary in 2772. Although young, "Gray" had been a soldier since he was five years old - fighting was literally the only thing he really knew how to do.