This stormtrooper served his duty on the first Death Star in the year 0 BBY, just before its demise during the Battle of Yavin.
During the time the Millennium Falcon was taken aboard the battle station, this stormtrooper's response to KE-829's inquiry concerning the BT-16 was overheard by Obi-Wan Kenobi.
The non-canon comic book series Star Wars: Tag & Bink, which is quite popular, later established that these two stormtroopers were actually Tag and Bink.