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Born into a ComStar family, Tucker and his sister Patricia both chose to continue the Harwells' seven generations of service to the organization, stretching back well before the ComStar Schism and Jihad.
Showing an almost prodigious understanding of most technical concepts from a young age, Tucker earned his doctorate in Hyperpulse Generator systems at the age of twenty-one, receiving a posting to ComStar's headquarters in Sydney on Terra as an Adept Alpha (Hyperpulse Generator Operation) a mere three months before Gray Monday in 3132. As ComStar desperately scrambled to restore the HPG network, Tucker's almost preternatural skills with Hyperspace Generator Systems and the theories of Thomas Kearny and Takayoshi Fuchida resulted in him being assigned to undergo advanced courses at the Cassie DeBurke Institute for Hyperspatial Studies by his former teacher Precentor Carole Ackerman. 
His performance at the DeBurke Institute attracted the attention of Ackerman's superior and Director of Special Projects, Precentor Malcolm Buhl. Impressed with the young man's reputation, Buhl dispatched Tucker to restore the HPG on the Republic of the Sphere world of Wyatt in 3135. Much to everyone's amazement and joy, Tucker succeeded and found himself in the midst of a three-way conflict between the Clan Nova Cat splinter group the Spirit Cats, defensive Republic of the Sphere troops, and an invasion force from the Oriente Protectorate attempting to secure his knowledge and the Wyatt HPG.
However Tucker was instead "rescued" by his sister and elements of the First Division of the secretly rebuilt Com Guard, kidnapped by the fanatical Blessed Order faction within the post-Jihad era ComStar. Tucker was forced to aid the faction in developing a method to repair the remaining non-functional HPGs for their benefit. While Tucker's methods of restoring the Wyatt HPG were disseminated after his disappearance, they only worked briefly if at all, making locating the young Adept even more vital.  Unfortunately Alexi Holt, an undercover Knight of the Sphere, would track them down to their secret Omega base on Luyten 68-28 and would escape with the rescued Harwell to alert the Republic of the reformed Com Guard unit's location. Just prior to Republic troops making planetfall on Luyten, Buhl would order a full withdrawn to their Alpha base on Epsilon Eridani. There, The Division was destroyed by Republic forces.
- Era Report: 3145, p. 117 "Major Personas - ComStar - Tucker Harwell"
- Era Report: 3145, p. 13 "History and Review - The Fall of Darkness"
- Field Manual: 3145, p. 140