Isaac Larsen was born in 2534 on the remote archipelago called Svalbard, in a town called Longyearbyen in northern Norway to his father, a soon-to-retire UNSC Marine Corps officer. Most of his childhood, due to the nature of where he grew up consisted of learning to hunt, track and stalk animals, as well as navigate the harsh mountains around his town. At the age of 13, his father enrolled him into military schooling and he was shipped out 2 years later, at the age of 15. At the age of 17 he graduated and moved onto the UNSC Marine Corps and later be selected for FORECON, and then to lead Task Force 262.