Crisis In Laos:---U.S. Fleet On Alert Units of the seventh fleet have been sped to the waters off southeast Asia as the situation in Laos becomes more critical. Red rebels, breaching the ceasefire, push 100 miles south, driving 2,000 royal troops across the border into Thailand. Shots of combat and refugees. Aerial of four naval carriers. Animated map of Laos. Mountains with clouds. Laos troops cross over bamboo / suspension bridge across river. CU soldiers, camouflage. Refugees board plane. Aid, bags loaded in trucks. Secretary of Defense Robert McNamara with Military officials.