After performing at the Nationals Park, Lee Greenwood met the US Army Chorus in the tunnel. While together, they started to sing an a cappella rendition of Lee's hit 'God Bless The USA.' This incredible moment is all caught on camera and it's absolutely amazing to hear. This song has blessed so many hearts across the nation and to see it performed like this brings tears to my eyes. God bless our country and the men and women who fight for that freedom each and every day.