Enlisting in the U.S. Marine Corps as a rifleman, he was assigned to the 2nd Raider Battalion, the U.S. Marines light infantry amphibious unit created during WWII.
Captured during the raid on Makin Island, he was executed on October 16, 1942. Private Mattison was never recovered.
He is memorialized in the Court of the Missing, Honolulu HI.
*Also see - Corporal Joseph N. Gifford