Watch Tom Hanks, Ron Howard, and More Thank Gary Sinise for Helping Veterans

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 LenoRon HowardSteve BuscemiRobert De NiroRob LoweTim AllenKellie PicklerMayim BialikColin 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".