There are no after-action reports that pinpoint where Kerry's boat was in late December 1968. But a file from Navy archives in Washington obtained by The Times provides support for both sides.
An entry in a monthly summary of engagements for December 1968 reports that on Christmas Eve, "PCF-44 fired on junk on beach. Results: 1 sampan destroyed."
The entry was made by then-Capt. Roy Hoffmann, the overall commander of Swift boats and now one of Kerry's most vocal critics. There is no written location for the engagement, but it contains a coordinate used by the military to plot locations. The coordinate points to an area about 40 to 50 miles south of the Cambodian border, near an island called Sa Dec.
The entry also notes that the incident took place about 7 a.m., which would have given Kerry's boat another 12 hours to make it to the Cambodian border by nightfall. At a cruising speed of 23 knots, the boat could have covered the distance in about two hours.
This would be consistent with the contention of Kerry spokesman Michael Meehan that Kerry was in Sa Dec but reached the Cambodian border later the same day.
Since the anti-Kerry ad first surfaced, Kerry's crewmates have fanned out in his defense. Along with Rassmann, crewmates Del Sandusky, leading petty officer with Kerry on PCF-94, and Gene Thorson decried the allegations as politically inspired "garbage."
Sen. John McCain (R-Ariz.), a Vietnam veteran who has endorsed Bush, called the ad "dishonest and dishonorable." He said that "none of these individuals served on the boat [Kerry] commanded," adding that he believed "John Kerry served honorably in Vietnam."
In a lengthy interview between the Swift Boat Veterans for Truth's first news conference in May and the controversy last week, Kerry called the group's allegations pure "politics."
"Some of them don't like the fact that I opposed the war, and 35 years later some people still want to argue about that," Kerry said in the June interview. "It's way beyond me, can I tell you? It's so far beyond and past now. I feel sad about it."
He said he respected the service all Swift boat crews gave to their country and lauded their courage.
"So I'm at peace with myself, and I'm sorry they feel the way they do," Kerry said, "because I respect them. I really do."