In his three years as a Mustang, Fullerton has intercepted seven passes, returning three of four touchdowns.
Fullerton had what could be considered the defensive highlight of the season last year when he intercepted a pitchout in his own red zone and returned it 90 yards for a touchdown against Southern Utah.
He has recorded 72 career tackles (50 solo) including five tackles for lost yardage and two sacks. Fullerton also has recorded three forced fumbles and 15 pass breakups. He helped lead the Mustangs to 8-3 record and a Football Championship Subdivision playoff berth last season.
Fullerton is joined on the All-American team by three other Great West Conference players: junior wide receiver Tysson Poots of Southern Utah (Third Team), senior defensive tackle Ko Quaye of South Dakota (Third Team) and senior punter Trevor Ward of Southern Utah (Second Team).
Poots caught 16 passes for 247 yards and a touchdown while Ward averaged 27 yards on five punts in a 69-41 loss to Cal Poly last year.
Quaye had three tackles (one solo) in a 49-22 loss to the Mustangs last season.
The Mustangs are ranked No. 12 in the preseason Any Given Saturday poll. Defending national champion Richmond is No. 1, followed by Appalachian State and Montana.
Cal Poly will open practice on Aug. 17 in preparation of their Sept. 12 season opener against Sacramento State at Alex G. Spanos Stadium.