Park Record Media Center

Brandon Valentine, of the U.S. Marine Corps, center, and from left, Gary LeVox and Jay DeMarcus, of the musical group Rascal Flatts, perform at ACM Presents an All-Star Salute to the Troops on Monday, April 7, 2014, in Las Vegas. (Photo by Chris Pizzello/Invision/AP) ( ACM Presents An All-Star Salute To The Troops )

Singers Carrie Underwood (L) and Craig Morgan speak onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483327745 )

Singers Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324625 )

Singers Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324899 )

Singers Brian Kelley (C) and Tyler Hubbard (R) of Florida Georgia Line perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328699 )

Singers Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324629 )

Musician Toby Keith accepts USO award onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328119 )

Entertainer Shawn Parr (L) and ACM Lifting Lives contest winner Navy Sgt. Cecil speak onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483332069 )

TV personality Nancy O'Dell speaks onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483327575 )

Actors Chris O'Donnell (L) and LL Cool J speak onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328551 )

Singer Tyler Hubbard of Florida Georgia Line performs onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324867 )

Entertainer Shawn Parr (L) and singer Gary LeVox of Rascal Flatts speak onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328903 )

Musician Toby Keith performs onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483331795 )

Singers Brian Kelley (L) and Tyler Hubbard of Florida Georgia Line perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324687 )

(L-R) Actors Chris O'Donnell and LL Cool J, U.S. Air Force Chief of Staff Gen. Mark A. Welsh III and USO President & CEO Brigadier Gen. (Ret.) John I. Pray Jr., and musician Toby Keith speak onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328985 )

Musician Toby Keith performs onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483327797 )

Singer Gary LeVox of Rascal Flatts (L) and Marine Staff Sgt. Brandon Valentine perform onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328893 )

Singer Carrie Underwood speaks onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483328101 )

Singer Brian Kelley of Florida Georgia Line performs onstage during ACM Presents: An All-Star Salute To The Troops at the MGM Grand Garden Arena on April 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for ACM) ( 483324909 )