>> that's right. he gave so much of himself to military men and women serving overseas, often visited by the comic. abc's martha raddatz has that part of the story. >> reporter: there was an instant connection between robin williams and our troops. never phony. never the privileged celebrity, just a comedian who helped them escape the cruelty of war or the aftermath of injuries. if just for a moment. he was the comedian who during uso tours would sneak away after his big performance to visit the troops who weren't able to attend. the dog handlers, the dining hall workers, the soldiers keeping guard. >> when i come here, for you, because i believe in you. >> reporter: it was in kuwait in 2007, entertaining the troops when robin williams had an unforgettable moment himself. ♪ >> uh-oh. >> reporter: retreat sounded.