What role did National Security Advisor Henry Kissinger play in Nixon’s approach to Vietnam?

READ THE INSTRUCTIONS CAREFULLY !
ONLY USE THE BOOK AS A SOURCE AND PUT IN QUOTATIONS ONLY FROM THE BOOK ! NO USE OF ANY OUTSIDE SOURCES ! NO OUTSIDE SOURCES !

BOOK AND ONLY SOURCE YOU CAN USE : David F. Schmitz. Richard Nixon and the Vietnam War: The End of the American
Century.. https://www.amazon.com/Richard-Nixon-Vietnam-War-American/dp/1442262265

INFO ABOUT THE PAPER :

David F. Schmitz in his book Richard Nixon and the Vietnam War: The End of the American Century wrote about Nixon’s views on the war in Vietnam at the beginning of his presidency. He argues that for the first two years of his administration, Nixon sought a conventional military victory and only moved to de-escalation and withdraw of American troops after this initial effort.

What role did National Security Advisor Henry Kissinger play in Nixon’s approach to Vietnam?