Following in the footsteps of his father, Tyree joined the Rendili Home Defense Fleet at sixteen. He served first aboard the Triumph and then the Relentless - both Dreadnaught Heavy Cruisers. Once his officer training was complete, he eventually left the Home Defense Fleet in order to join the Republic's Judicial Forces.
Tyree served aboard the [[Brenik], where he qualified as a fighter pilot. He was still aboard and serving as a Major when the Clone Wars broke out; but the influx of clone troopers caused many of the "less expendable" veterans to be reassigned into leadership and command roles. Vansen became a Tactical Officer commanding the V-19 Torrent Wing aboard the Challenger, a Venator Attack Cruiser.
The Challenger was badly damaged during the Battle of Bothawui; Vansen was selected by Captain Anpher Inirial to serve as his Executive Officer aboard the Valkyrie, one of the new Victor Star Destroyers. After Inirial was injured in the line of duty, Vansen assumed command, and remained Captain of the Valkyrie well into the New Order.
As an Imperial officer, Captain Tyree was ultimately given command of an Imperial Star Destroyer: the Horizon. He remained in command for the rest of his career, which ended prematurely after he lost an eye in a scuffle with protestors at a Rendili Navy Yard, shortly after the destruction of Alderaan. Already unsettled by the planet's destruction himself, he chose to use the medical grounds to retire from service, and settled down into what he hoped would be a quiet life on Thalia.
After the Battle of Endor, the Rebel Alliance found itself in need of experienced veterans to replace its losses. Vansen was approached and, after quite some convincing, was drafted to serve within the Rebel fleet. He first commanded the Valiant, an MC40a Star Cruiser assigned to hit-and-run operations against Imperial supply lines along the Hydian Way. He was later reassigned to assume command of the Horizon, a Vindicator Heavy Cruiser; aboard that ship he commanded the successful Liberation of Bothawui. Promoted to Commodore, he commanded the Horizon as his flagship in Task Force 75, assigned to interdict Corporate Sector convoys trying to use the Perlemian Trade Route to evade The Independents.
A year later, he was selected to command the defensive forces protecting The Wheel - a secret convoy of Jedi refugees - and transferred his flag to the Star Destroyer Challenger: the same ship he had served on nearly thirty years previously.
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