GARY SINISE does TONS of charity work on behalf of veterans, first responders, and their families. So a whole bunch of people made a video to thank him for everything he's done.
They include Jay Leno, Ron Howard, Steve Buscemi, Robert De Niro, Rob Lowe, Tim Allen, Kellie Pickler, Mayim Bialik, Colin Powell, and more. Some of the vets and their families who've benefitted from his generosity also contributed.
Fittingly enough, the video ends with TOM HANKS saying, quote, "Thanks, Lieutenant Dan!"
And he just released a book called "Grateful American".