Thailand: Hitting a Haven

Officials in Bangkok habitually argue that Thailand — Communist insurgency problems notwithstanding — is not at all like Viet Nam. Last week Thai Communist guerrillas, who until now have confined their terrorism to ambush and intimidation in the countryside, challenged that notion with the kind of bold attack that has become routine in Viet Nam: a commando raid on an airfield.

The Communists' target was the Royal Thai Air Force Base at Udorn, one of five Thai fields from which U.S. fighter-bombers fly daily strikes into North Viet Nam and Communist-held parts of Laos. Udorn, only a few miles from...