Scott Fillion

Fillion was a male Starfleet security officer holding the rank of Lieutenant. Soon after transferring to the USS Enterprise-E in 2379 he was part of the Delta team under the command of Lieutenant Christine Vale which was sent to Tezwa's Nokalana Sea to destory the nadion-pulse cannon firebase located there underwater.

Before transferring to the Enterprise, Fillion washed out of Starfleet Special Ops. Christine Vale hypothesized that Fillion's habit of making smart remarks in response to being given orders was likely a key factor in this. (TNG: A Time to Kill)