John Kerry on Tuesday condemned a television ad that criticizes President Bush’s Vietnam-era service in the Texas Air National Guard

No one denies Mr. Kerry’s four bemedaled months in “Swiftboats” or his seven-months’ service as an electrical officer on board the USS Gridley, during its cruises back and forth to California, or even his months as an admiral’s aide in Brooklyn, before he was able get out of the Navy six months early to run for office.

Taking a look at Mr. Kerry’s much-promoted Vietnam service, his military record was, indeed, remarkable in many ways. Last week, the former assistant secretary of defense and Fletcher School of Diplomacy professor, W. Scott Thompson, recalled a conversation with the late Admiral Elmo R. Zumwalt Jr. that clearly had a slightly different take on Mr. Kerry’s recollection of their discussions:

“[T]he fabled and distinguished chief of naval operations,Admiral Elmo Zumwalt, told me — 30 years ago when he was still CNO —that during his own command of U.S. naval forces in Vietnam, just prior to his anointment as CNO, young Kerry had created great problems for him and the other top brass,by killing so many non-combatant civilians and going after other non-military targets.‘We had virtually to straitjacket him to keep him under control,’ the admiral said. ‘Bud’ Zumwalt got it right when he assessed Kerry as having large ambitions — but promised that his career in Vietnam would haunt him if he were ever on the national stage.” And this statement was made despite the fact Zumwalt had personally pinned a Silver Star on Mr. Kerry.

Mr. Kerry was assigned to Swiftboat 44 on December 1, 1968. Within 24 hours, he had his first Purple Heart. Mr. Kerry accumulated three Purple Hearts in four months with not even a day of duty lost from wounds, according to his training officer. It’s a pity one cannot read his Purple Heart medical treatment reports which have been withheld from the public. The only person preventing their release is Mr. Kerry.

By his own admission during those four months, Mr. Kerry continually kept ramming his Swiftboat onto an enemy-held shore on assorted occasions alone and with a few men, killing civilians and even a wounded enemy soldier. One can begin to appreciate Zumwalt’s problem with Mr. Kerry as commander of an unarmored craft dependent upon speed of maneuver to keep it and its crew from being shot to pieces.

Mr. Kerry now refers to those civilian deaths as “accidents of war.”And within four days of his third Purple Heart, Mr. Kerry applied to take advantage of a technicality which allowed him to request immediate transfer to a stateside post.

Outside of his own “accidents of war,” there is no evidence that Mr. Kerry had then or has now the least idea what may or may not have been the realities of ground combat. However, he had no problem reeling off for the Senate a series of unproven, secondhand allegations that would have been perfectly at home at the Nuremberg trials indicting his fellow veterans.

Mr. Kerry has already confessed his complicity in killing civilians as “accidents of war.” However, he has offered a classic Nuremberg defense that this was not only a commonplace occurrence throughout the Vietnam War, but he was carrying out a policy “with the full awareness of officers at all levels of command.”

His commander of naval operations in Vietnam, who specifically designed the mission that Mr. Kerry and the other Swiftboat commanders executed, Admiral Zumwalt, clearly disagreed. An examination of the truth behind this disagreement is not an attack on Mr. Kerry. It is a matter of vital historical interest.