 The Cooper – Church Amendment was resurrected during the winter and incorporated into the <unk> Foreign Assistance Act of 1970 . This time the measure made it through both houses of Congress and became law on 22 December . As a result , all U.S. ground troops and advisors were barred from participating in military actions in Laos or Cambodia , while the air war being conducted in both countries by the U.S. Air Force was ignored . 
