Tuba originally joined the Emperor's Hammer in mid-1996 as a TIE Corps pilot for Delta Squadron, tasked with reconnaissance aboard SSSD Sovereign. Rising through the ranks, he was promoted to Lieutenant Commander and appointed Flight Leader of Delta's second flight, achieving the designation Delta 2-1. Tuba remained in that position until early 1998 when he transferred to the EH Reserves aboard the Modified Frigate Phoenix. Unfortunately all records from that period were lost, except for Tuba's rank designation.
During that time, Tuba also joined the Dark Brotherhood, rising to the rank of Guardian. Little is known of his activities while a member of the secretive Dark Jedi organization.