Actor Gary Sinise is among a growing number of advocates, educators and organizations working to ensure the history of Sept. 11 doesn’t fade as a new generation grows up with no memory of the attacks.

His foundation provides free educational trips to Ground Zero, the Pentagon and Shanksville, PA — and he’s now part of a new documentary that will “live on and on and be part of the canon” around the Trade Center tragedy.

“It’s not just about how America was attacked but remembering how Americans answered,” Sinise, 71, told The Post. “We want to change the slogan ‘Never forget’ that was made by people who were there to witness the Trade Center…

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