Marko was a male Human who held the rank of ensign within the Republic Army throughout the Cold War. He was stationed on the planet of Taris as a member of Search and Rescue Squad 204. Under the command of Sergeant Elara Dorne, Marko's duties included attending to injured personnel when the squad arrived at Fallenspire Stronghold on Taris to extract captured Republic soldiers; this was upon the order of Elara.