Toby Keith, Jessica Simpson, Clint Black and Joe Nichols will be featured in an ABC special titled America United: In Support of Our Troops airing Sept. 7. The two-hour special will also feature appearances and performances by Janet Jackson, Snoop Dogg, Pam Anderson, D.L. Hughley, ZZ Top, Kathy Griffin, Ne-Yo, Girls Next Door, Ali Landry (former Miss America), Carlos Mencia, Shawne Merriman (San Diego Charters linebacker), Jordin Sparks, Sam Moore (Sam & Dave) and Charlie Wilson (the Gap Band).