Lyndon Johnson actually said...

"South Viet-Nam has been attacked by North Viet-Nam. It has asked our help."

"We are giving that help, we are giving it because of our commitments, because of our principles, and because we believe that our national interest demands it."

"We know that we must find some way, somehow, a path to peaceful settlement."

"Whatever we are doing in faraway places--many with strange-sounding names--we are doing it not for power, not for territory, not for dominion, or not for influence."