From pwinsider.com: Among the people going on the WWE Tribute to the Troops trip include Vince McMahon, John Cena, JBL, Maria, Bobby Lashley, CM Punk, Hardcore Holly, Lilian Garcia, Undertaker, Edge, Randy Orton, Jeff Hardy, Shelton Benjamin, Carlito and Melina. There are probably a few more people going on the trip, but these are the names that have been revealed thus far.
Lilian Garcia grew up as an Army brat, while John "Bradshaw" Leyfield is the troops' Number One Fan (real deal). Rick Flair always goes if he's able. Lashley was a multiple year military champion while in the Army.
I'm a bit stumped by Randy Orton going, as he was court-martialed out for AWOL. That boy's truly rotten, having actually dumped in women's handbags backstage as a "joke".