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.
29/5 Dylan Moran
3-6/6 Sweden Rock Festival
19-21/6 Graspop Metal Meeting
24/6 ZZ Top