Vallien was a 24th century Vulcan Starfleet officer. He hailed from a polar region of the planet Vulcan, inhabited by a blond-haired ethnic sub-group (a notably different physical feature compared to Vulcan's dark-haired majority). (Star Trek: Arcadia) Vallien joined the UFS Arcadia's Tactical Department in late 2378. He often manned the bridge tactical station. His exact age was unrevealed, but he was considered young for a Vulcan. He continued serving in this capacity until as late as 2386.
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