Bren Derlin was a male Human officer of the Alliance of Nations. He joined the Alliance military after his father, anti-axis Senator Galen Derlin, was assassinated by agents of the Pure Emperor. Showing his talent, Bren Derlin became a captain and served during the Battle of Ralltiir. His heroic actions saving lives during the Battle of Nentan merited him a new promotion, and Major Derlin served both in Alliance Intelligence and as the operations and security chief at the Alliance headquarters on the planet Hoth, Echo Base, under the command of General Carlist Rieekan. Derlin, in this post, gave the hardest orders in his life by closing the base door risking the lives of two valuable Rebels whom he himself considered his friends, to avoid putting the whole base in risk.