B. Taylor was a male Tau'ri who became a Special Agent in the Bureau of Alcohol, Tobacco and Firearms. In 1999, he was involved in the operation to gather intelligence about the Cult of Setesh in their base north of Seattle, Washington. (SG1: "Seth")
This character was not named in the episode he appeared in, nor in the credits for the episode, but was revealed when props from Stargate SG-1 were sold on eBay by Propworx. One of the items sold was a "Stargate ATF Badge" which had the name B Taylor on it.