Yep. Bruce Kulick, John Corabi, Chuck Garric and, on this tour, Fred Coury.
These days it's basically the same band as Eric Singer Project. Singer has even sat in on drums for Union before.
Originally Union's line-up had Brent Fitz and Jamie Hunting.
17/7 Ripper Owens
18/9 Theater Equation
26/9 Ugly Kid Joe