 He attended Brandon High School in Brandon, Florida, where he was a standout high school football player for the Brandon Eagles.Galloway was six feet, three inches tall and weighed 225 pounds in high school; he was a dominating athlete in basketball, football and track.As a senior for the Eagles in 1977, he was an all-state, prep All-American defensive lineman in football, led Hillsborough County in basketball dunks, and helped the Brandon Eagles to an 18–2 conference basketball title, and threw the shot and discus for the track team.