ABC News' Martha Raddatz interviews Chairman of the Joint Chiefs of Staff Mark Milley about his 44-year career before he retires at the end of the month. WATCH the ABC News Live Stream Here: youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: bit.ly/2vZb6yP Watch More on abcnews.go.com LIKE ABC News on FACEBOOK facebook.com/abcnews FOLLOW ABC News on TWITTER: twitter.com/abc #markmilley #retirement #ABCNLUpdate #abcnews