Union #1 [1997 - 2000]

Bruce Kulick - lead guitar, vocals
John Corabi - vocals
Jamie Hunting - bass
Brent Fitz - drums

Union #2 [2005]

Bruce Kulick - lead guitar, vocals
John Corabi - vocals
Chuck Garric - bass
Fred Coury - drums

Eric Singer Project #1 [Dec 1997 - 2005]

Eric Singer - drums, vocals
Bruce Kulick - lead guitar, vocals
John Corabi - guitar, vocal
Karl Cochran - bass, vocals

Eric Singer Project #2 [2005 - present]

Eric Singer - drums, vocals
Bruce Kulick - lead guitar, vocals
John Corabi - guitar, vocal
Chuck Garric - bass, vocals