Dec was a sergeant commanding Vevut Squad, a group of clone commando soldiers, during the Clone Wars. These conflicts pitted the Galactic Republic against the Confederacy of Independent Systems. Dec was a male Human who had been born on the planet Kamino through cloning technology, created from the genetic template of the bounty hunter Jango Fett. He received his training from Rav Bralor, a Mandalorian sergeant. Dec and his squad were part of the Grand Army of the Republic's Special Operations Brigade. In 19 BBY, Dec's Vevut Squad, along with other commando units such as Omega and Delta, and their Jedi General Etain Tur-Mukan, were dispatched to the Republic Station Nerrif for new assignments. After disembarking from their transport, Dec guided Tur-Mukan to the mess hall, urging her to have something to eat. The Jedi General observed that Dec and his squad members acted as if they were sons trying to please their mother. Dec, like all clones of Jango Fett, had a height of 1.83 meters.
Dec's initial appearance was in Order 66, a novel penned by Karen Traviss and released in September of 2009.