With the first full day of the NFL season falling on Sept. 11 this year, the league has announced that it will be commemorating the 15th anniversary of the 9/11 terrorist attacks at all 13 games sites on Sunday.

Before the 1 p.m. ET games kick off, everyone watching at home and in each stadium will see a video message from President Barack Obama. The same message will also be featured before the kickoff of the 4 p.m. games.

Viewers of the two games that kickoff at 4:25 p.m. ET will be shown a video message taped by former president George W. Bush, who had just taken office eight months before the terrorist attacks in 2001.

Bush will also be on hand for the Cowboys-Giants game in Dallas on Sunday, where he'll take part in the opening toss with his wife, Laura. The Bushes will be joined at midfield by two NYPD officers who were at Ground Zero on the day of the attack.

The Giants-Cowboys game will also feature some nifty cleats that Odell Beckham and Victor Cruz will wear to commemorate the 15th anniversary of 9/11.

At the Browns-Eagles game in Philadelphia, Vice President Joe Biden will attend and help hold the flag during the national anthem. Biden will be joined by 120 first responders who were at Ground Zero on Sept. 11, 2001.

After the early games, Bush and Obama will both be featured in a message that will air before the Patriots play the Cardinals on Sunday night.

For each game, all players will wear a special 9/11 decal on their helmet. You can see below what that decal will look like.

Although coaches won't be wearing a decal, they will be wearing a 9/11 lapel pin.

The biggest game of the day will take place in New York, where the Jets will commemorate the 15th anniversary of 9/11 with a pregame tribute before they play the Bengals. According to ESPN.com, Jets players and coaches will be wearing NYPD, FDNY and Port Authority hats in pregame.

Bengals coach Marvin Lewis has been stressing the importance of the 9/11 anniversary to his team.

"Everybody knows the fact that we were selected to go play in New York on 9/11 is a huge thing," Lewis said, via ESPN.com. "We've educated our players on that and what it means; the significance of it, the impact of that day on the city of New York, the area, and our country. We'll be ready to play, but it will be an emotional day for a lot of folks around them, and I wanted them to be conscious of that."

The NFL Network will also be airing a special on Sept. 9 that will focus on how the league handled the events of 9/11. All NFL games were canceled the first week after the terrorist attacks.