An American flag is displayed on the file as Gladys Knight sings the national anthem before the NFL Super Bowl 53 football game between the Los Angeles Rams and the New England Patriots Sunday, Feb. 3, 2019, in Atlanta. (AP Photo/Morry Gash)

A general view is seen during the singing of the National Anthem prior to a week 16 NFL football game between the Denver Broncos against the Oakland Raiders on Monday, Dec. 24, 2018 in Oakland, Calif. Oakland won 27-14. (Aaron M. Sprecher via AP)

Overall view of a full field sized American flag during the national anthem before a 2018 NFL week 14 regular season game between the Dallas Cowboys against the Philadelphia Eagles, Sunday, Dec. 9, 2018 in Arlington, Texas. The Cowboys defeated the Eagles in overtime, 29-23. (James D. Smith via AP)

The Jacksonville Jaguars mascot carries an American flag onto the field before an NFL football game against the Indianapolis Colts Sunday, Dec. 2, 2018, in Jacksonville, Fla. (AP Photo/Phelan M. Ebenhack)

National Anthem before an NFL regular season football game at the Los Angeles Memorial Coliseum with the American Flag on the field against the Kansas City Cheifs and the Los Angeles Rams on Monday, Nov. 19, 2018 in Los Angeles. The Rams won, 54-51. (Ric Tapia via AP)

Los Angeles Rams quarterback Jared Goff (16) carries out the American flag during an NFL football game against the Seattle Seahawks on Sunday, Nov. 11, 2018 in Los Angeles, Calif. (Greg Trott via AP)

A member of the United States Army Parachute Team Parachute into Heinz Field prior to a week 10 NFL football game between the Pittsburgh Steelers and the Carolina Panthers on Thursday, Nov. 8, 2018 in Pittsburgh. Pittsburgh won 52-21. (Aaron M. Sprecher via AP)

The American Flag is held during the National Anthem before an NFL football game between the Jacksonville Jaguars and the Indianapolis Colts in Indianapolis, Sunday, Nov. 11, 2018. (AP Photo/Michael Conroy)

New York Jets linebacker Frankie Luvu (50) carries the American flag onto the field before an NFL football game against the Buffalo Bills, Sunday, Nov. 11, 2018, in East Rutherford, N.J. (AP Photo/Seth Wenig)

Carolina Panthers outside linebacker Shaq Green-Thompson (54) takes the field with an American flag during player introductions prior to an NFL game against the Tampa Bay Buccaneers, Sunday, Nov. 4, 2018, in Charlotte, N.C. (Aaron Doster via AP)

New England Patriots wide receiver Julian Edelman charges onto the field in front of American flags before an NFL football game against the Indianapolis Colts, Thursday, Oct. 4, 2018, in Foxborough, Mass. (AP Photo/Charles Krupa)

Members of the military unfurl an football field size American flag before an NFL football game between the Dallas Cowboys and the New York Giants in Arlington, Texas, Sunday, Sept. 16, 2018. (AP Photo/Michael Ainsworth)

Fans wave flags before the NFL Super Bowl 51 football game between the Atlanta Falcons and the New England Patriots, Sunday, Feb. 5, 2017, in Houston. (AP Photo/Eric Gay)

General view of the interior Georgia Dome from above during the National Anthem with an American Flag on the field before an NFC Divisional Playoff NFL football game against the Seattle Seahawks and the Atlanta Falcons on Saturday, Jan. 14, 2017 in Atlanta. The Falcons won, 36-20. (Ric Tapia via AP)

New England Patriots mascot Pat Patriot stands for the national anthem prior to a game against the Houston Texans, Saturday, Jan. 14, 2017 in Foxborough, Mass. The New England Patriots won 34-16. (Logan Bowles via AP Images)

Members of the U.S. military run onto the field carrying American flags as fireworks go off in the background before the New England Patriots Super Bowl LI football game against the Atlanta Falcons on Sunday, Feb. 5, 2017 in Houston. The Patriots won the game 34-28 in overtime. (Paul Spinelli via AP)

Dallas Cowboys coach Jason Garrett (center) and his team stand at attention behind a field-sized United States flag during the national anthem before an NFL football NFC divisional playoff game against the Green Bay Packers, Sunday, Jan. 15, 2017, in Arlington, Texas. The photo was taken with a wide angle fisheye lens. The Packers defeated the Cowboys, 34-31. (James D. Smith via AP)

An American flag covers the Arrowhead Stadium field during fireworks before the start of an NFL game between the Kansas City Chiefs and the San Diego Chargers in Kansas City, Mo., Sunday, Sept. 11, 2016. (AP Photo/Reed Hoffmann)

A general, overall view of the interior of the Georgia Dome as a large American Flag is seen on the playing field while the National Anthem is sung during the NFC Championship playoff football game between the Green Bay Packers against the Atlanta Falcons, Sunday, Jan 22, 2017, in Atlanta. The Falcons won 44-21. (Scott Boehm via AP)

A servicewoman holds up a flag during the national anthem before an NFL football game between the San Francisco 49ers and the Atlanta Falcons in Santa Clara, Calif., Sunday, Nov. 8, 2015. (AP Photo/Marcio Jose Sanchez)

New York Jets wide receiver Brandon Marshall (15) holds an American flag during Salute to Service ceremonies before an NFL football game against the Jacksonville Jaguars, Sunday, Nov. 8, 2015, in East Rutherford, N.J. (AP Photo/Seth Wenig)

Members of the New Orleans Military and Maritime Academy honor guard rehearse with American flags as part of Salute to Service Month before an NFL football game between the New Orleans Saints and the Tennessee Titans in New Orleans, Sunday, Nov. 8, 2015. (AP Photo/Jonathan Bachman)

A field size American Flag is displayed to promote the NFL's Salute to Service at Gillette Stadium, home of the New England Patriots prior to the NFL week 9 regular season football game against the Washington Redskins on Sunday, Nov 8, 2015 in Foxboro, MA. The Patriots won the game 27-10. (AP Photo / Jim Mahoney)

The flag is displayed as shown with this fisheye lens prior to an NFL football game between the Arizona Cardinals and the New Orleans Saints, Sunday, Sept. 13, 2015, in Glendale, Ariz. (AP Photo/Rick Scuteri)

Carolina Panthers' Charles Tillman (31) carries a flag as he is introduced before an NFL football game against the Green Bay Packers in Charlotte, N.C., Sunday, Nov. 8, 2015. (AP Photo/Chuck Burton)

General view of the interior of Levi's Stadium from field level before the NFL regular season game against the Minnesota Vikings and the San Francisco 49ers on Monday Sept. 14, 2015 in Santa Clara, Calif. The 49ers won, 20-3. (Ric Tapia via AP)

Members of the Jacksonville Jaguars Jax Pack carry large American flags as they lead the team onto the field against the Carolina Panthers in an NFL game, Sunday, Sept. 13, 2015, in Jacksonville, Fla. (AP Photo/Rick Wilson)

Lucas Oil Stadium with the American Flag representing the NFL Salute to Service shown during the singing of the National Anthem prior to the NFL week 11 regular season football game with the Indianapolis Colts against the New England Patriots on Sunday, Nov 16, 2014 in Indianapolis. The Patriots won the game 42-20. (AP Photo/Jim Mahoney)

Denver Broncos fans hold up American flags before the start of an NFL football game against the Oakland Raiders, Monday, Sept. 12, 2011, in Denver. (AP Photo/Julie Jacobson)

An american flag is displayed on the field during the National Anthem prior to the game between the New York Giants and Seattle Seahawks, Sunday, Nov. 9, 2014, in Seattle. (Ben Liebenberg/NFL)

Members of the U.S. Armed Forces carry American Flags ahead of the New England Patriots prior to the NFL AFC Divisional Playoff football game against the Baltimore Ravens on Saturday, Jan. 10, 2015 in Foxboro, MA. The Patriots won the game 35-31. (AP Photo / Jim Mahoney)

Members of the U.S. armed forces hold an American flag during the playing of then national anthem before an NFL football game between the Indianapolis Colts and Dallas Cowboys, Sunday, Dec. 21, 2014, in Arlington, Texas. (AP Photo/Tim Sharp)

An overall view of the field covered with an oversize American flag for the Carolina Panthers against the Philadelphia Eagles on Monday November 10, 2014 at Lincoln Financial Field in Philadelphia. (Damian Strohmeyer/AP Images)

An american flag is displayed on the field during the National Anthem prior to the game between the New York Giants and Seattle Seahawks, Sunday, Nov. 9, 2014, in Seattle. (Ben Liebenberg/NFL)

A general view is seen during the singing of the National Anthem prior to an NFL football game between the Indianapolis Colts against the New York Giants at MetLife Stadium on Monday November 3, 2014 in East Rutherford, New Jersey. Indianapolis won 40-24. (Aaron M. Sprecher/NFL)

American flag pregame at the NFL game, New York Jets against the San Diego Chargers on January 8, 2005 at Qualcomm Stadium in San Diego, California. The Jets defeated the Chargers 20-17. (Photo by David Drapkin/AP)

A U.S. Marine and an American flag during an NFL football game between the Dallas Cowboys and San Diego Chargers, Sunday, Dec. 13, 2009, in Arlington, Texas. (AP Photo/Michael Thomas)

The American flag is unfurled during the singing of the National Anthem prior to the Arizona Cardinals contest against the Philadelphia Eagles in the NFC Championship Game at University of Phoenix Stadium on January 18, 2009 in Glendale, Arizona. The Cardinals defeated the Eagles 32-25. (AP Photo/Paul Spinelli)

A large American flag is presented during the national anthem in the NFL's Salute to Service before an NFL football game between the San Francisco 49ers and the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Jeff Chiu)

United States Marines hold the American Flag at Gillette Stadium during the singing of the National Anthem with the United States Air National Guard F-15s flyover as the NFL Salutes to Service prior to the 2014 NFL week 12 football game with the New England Patriots against the Detroit Lions on Sunday, Nov 23, 2014 in Foxboro, MA. The Patriots won the game 34-9. (AP Photo / Jim Mahoney)

A general overall view of Arrowhead Stadium from the upper deck as an American Flag is displayed on the field and fireworks are set off prior to a week four NFL football game between the New England Patriots and Kansas City Chiefs on Monday, Sept. 29, 2014 in Kansas City, Mo. The Chiefs won the game, 41-14. (AP Photo/G. Newman Lowrance)

United States Marines unfold up a giant American flag during the a pre-game ceremony before an NFL football game against the Seattle Seahawks on Sunday, Sept. 14, 2014, in San Diego. (AP Photo/Gregory Bull)

Arizona Cardinals cheerleaders help hold the American Flag during the National Anthem before an NFL football game against the St. Louis Rams, Sunday, November 9, 2014 at University of Phoenix Stadium in Glendale, AZ. The Cardinals won the game, 23-14. (AP Photo/Gene Lower)

An American Flag covers the field below the new scoreboard before the Jacksonville Jaguars play against Atlanta Falcons August 28, 2014 at Everbank Field in Jacksonville, Florida. The Falcons defeated the Jaguars 24 - 14 in the fourth week of the preseason. (AP Photo / Al Messerschmidt)

Tampa Bay Buccaneers defensive end Daniel Te'o-Nesheim (50) carries the American flag onto the field during team introductions before an NFL football game against the Atlanta Falcons Sunday, Nov. 17, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

An American Flag is waved on the field in honor of Veteran's Day at the Arizona Cardinals game against the New York Giants at Sun Devil Stadium on November 14, 2004 in Tempe, Arizona. The Cards defeated the Giants 17-14. (AP Photo/Paul Spinelli)

Indianapolis Colts outside linebacker Josh McNary carries the American flag before the first half of an NFL football game against the New England Patriots, in Indianapolis, Sunday, Nov. 16, 2014. (AP Photo/Michael Conroy)

A large American flag is unfurled before an NFL football game between the San Francisco 49ers and the Atlanta Falcons in San Francisco, Monday, Dec. 23, 2013. The 49ers are playing their last regular season game at Candlestick before moving a new stadium for the 2014 season. (AP Photo/Matt Sumner)

A field size American Flag on the field for the National Anthem prior to the first half of an NFL football game between the Philadelphia Eagles and the Jacksonville Jaguars, Sunday, Sept. 7, 2014, in Philadelphia. (AP Photo/Chris Szagola)

The American flag is displayed on the field prior to an NFL football game between the New York Jets and Green Bay Packers at Lambeau Field on Sunday, Sept. 14, 2014 in Green Bay, WI. The Packers beat the Jets 31-24. (Todd Rosenberg/NFL)

A military choir performs the national anthem in an overhead view from the upper deck of NRG stadium with the Houston Texans logo and the United States Flag behind them for military appreciation, salute to service day before a Week 12 NFL football game against the Cincinnati Bengals on Sunday, Nov. 23, 2014, in Houston. The Bengals beat the Texans 22-13.(AP Photo/Matt Patterson)

A young boy walks underneath an over-sized American flag before an NFL football game between the Denver Broncos and the New England Patriots in Denver, Md., Sunday, Jan. 19, 2014. (AP Photo/Julie Jacobson)

Troops carry American Flags as they run on the field during an NFL football game between the Denver Broncos and the Kansas City Chiefs, Sunday, Nov. 17, 2013, in Denver. (AP Photo/Jack Dempsey)

The American Flag covers the field before the Pro Bowl on Sunday, Jan. 25, 2015, in Glendale, Ariz. (AP Photo/Gene Lower)

A U.S. flag in the shape of the continental United States is displayed on the field of Lucas Oil Stadium before an NFL football game between the Indianapolis Colts and the Houston Texans in Indianapolis on Sunday, Nov. 8, 2009. (AP Photo/AJ Mast)

Houston Texan fans wave their American Flags during halftime of an NFL football game against the Cincinnati Bengals, Sunday, Nov. 23, 2014, in Houston. (AP Photo/Patric Schneider)