Starbase 28 was a United Federation of Planets facility active in at least the 2270s. The planet-based facility had structures of a very utilitarian design that evoked a "businesslike" atmosphere. Under normal conditions, the sky was green. Leslie Brennan had been assigned to this starbase in 2276 as an engineering specialist. By 2304, she had become chief engineer of the attack carrier USS Vella Core. (Star Trek: Avenger: "Star Survey")