Arro Basteren was a human male soldier who grew up on the planet Ertegas and joined the Alliance to Restore the Republic in their fight against the Galactic Empire during the Galactic Civil War. He became a member of the Marine Corps of the Rebel Alliance Special Forces and was a private, primarily serving as spotter to the sniper Serchill Rostok. Basteren was one of several soldiers recommended by General Davits Draven for possessing the fearlessness and self-awareness and considered by the general for a potential mission to raid the headquarters of Saw Gerrera’s Partisans on Jedha. Later, he and his fellow soldiers volunteered for an unsanctioned mission to steal the Death Star’s plans from the Citadel Tower on the planet Scarif in 0 BBY. Basteren perished in the battle that followed, helping to ensure that the plans were transmitted to the Alliance Fleet.