every signor had an obligation. spompl -- responsibility to come to the aide of any country attacked. >> a war had already been taking place for four years between vietnamese parties. of course growing american involvement under kennedy. >> kennedy sent 20,000 troops into vietnam. >> we were fighting in vietnam. >> that's all the commitment and all the statements that kennedy made, bobby kennedy made, and i would be the first american president to put my tail between my legs and run out. didn't have the courage to stand up. of two other presidents. >> for lbj who had been kept out of decision making with regard to vietnam, he believed he had no choice but to keep on kennedy's secretary of state, dean rusk, and what they wanted to do was stay the course and continue kennedy's legacy with