Last night, 24 hours after the Academy of Country Music, the ACM cameras rolled again and shot a tv special saluting the troops with Toby Keith,The Band Perry and Carrie Underwood. At this show in Vegas, Carrie premiered a new song called "Keep Us Safe" and received a standing ovation both times she sang it. Apparently, she was so touched by the song that she got emotional and had to sing it again for the tv cameras. Watch this fan video. Can't wait to see the show on tv on May 20th.