north vietnamese struck south of the demilitarized zone. >> the vietnamese are unserved. >> they're feeling alienated from their principal arise. they see this as a bold effort to bring the war to a close or put themselves in a better position with respect to negotiations. >> the president has decided to keep american troops out of the fight and to keep them coming home on schedule no matter what happens to the south vietnamese. he will limit action to air strikes against enemy forces in south as well as north vietnam. >> the americans respond in great force, so you see an absolutely massive aerial bombardment. >> the latest of mr. nixon's