According to the Vietnam air war episode on the SECRETS OF WAR series, tehre were rumours that volunteers from the USSR, Cuba, East Germany & other Eastern bloc countries were flying air-defence missions in NVAF MIGs against the might of the USAF & USN- although such rumours were never verified, with other allegations also being made that such claims of foreign involvement simply reflected patronising American attitudes of incredulity towards an enemy they considered backward or inferior & therefore who 'must' have sough assistance from 'real' pilots to fly their nice new MIGs for em. Now, WI such allegations had been proven true ? Say, if an NVAF MIG- piloted by a Soviet/Cuban/East German/whoever was shot down while pursuing US planes over the Gulf of Tonkin, or perhas after starying over the border into the DMZ, with said enemy pilot being somehow picked up by a USAF or USN CSAR helo ? How would evidence of direct Soviet bloc military involvement in Vietnam have affected the US conduct of the war in Vietnam ?