U.S. TO LET FORCES GO INTO CAMBODIA IN 'SELF-DEFENSE'; But Power of Commanders in Vietnam Is Limited to Extreme Instances SANCTUARY' RULED OUT Enemy Advantage at Border Is Said to Justify Action for Troops' Protection U.S. TO LET FORCES GO INTO CAMBODIA
US field comdrs reptd authorized to pursue enemy troops into Cambodia and to call for arty barrages and tactical air strikes on enemy positions there in cases of 'clear self-defense'; move stems from queries raised by US units that, in Iadrang Valley battle, were forced to pull up short near Cambodian border; Norodom Sihanouk reptdly has not been informed of new US policy, is expected to object; new policy distinguished from 'hot pursuit' doctrine which permits a mil force to follow enemy back into territory from which it came; map