Sadly, it'd be a short one. Certainly including Mr. Gibson, but also James Woods and Sean Astin (Lord of The Rings' Samwise Gamgee), who is also an aide to the Secretary of the Army. I believe that Ah-Nold can also be included, as can Bruce Willis, Tom Selleck, and of course Charleton Heston.
On the music side, Charlie Daniels has always been a staunch patriot, and so has Toby Keith and Aaron Tippin (Country stars think differently than their pop music brethren). surprisingly, Joan Jett & the Blackhearts ("I Love Rock n' Roll) are also a supporter, and have done several USO tours to entertain the troops in Afghanistan. I'm certain that there are more, but no one's interviewing them.