John O'Neill, who was a Nixon operative at the time, had claimed that no one was allowed in Cambodia. But it turns out O'Neill was...drum roll please...LYING.
"I was in Cambodia, sir. I worked along the border," said John E. O'Neill in a conversation that was taped by the former president's secret recording system. The tape is stored at the National Archives in College Park, Md.
http://mediamatters.org/items/200405040004Freepers will say that Kerry was in Vietnam and left in 1969, a year before the US officially invaded Cambodia. One issue about all this was that there aren't state line signs in the Mekong Delta at the height of war. And if you look at these book titles, you see that Cambodia was in US targets for a while:
"Cambodia, Secret Bombing of, United States campaign during the Vietnam War (1959-1975). Conducted under the direct orders of President Richard Nixon, it began in 1969 and continued until 1973.
© 1993-2003 Microsoft Corporation. All rights reserved.
From The Eyewitness History of Vietnam 1961 - 1975
Associated Press, Library of Congress. 1983
Chapter 11, Cambodia and Laos, Page 141
Another snip from another site shows it was certainly possible for Kerry to have been in Cambodia.
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 (one of the SBVFT), 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.
http://www.gregsopinion.com/archives/004854.phpThe main point is that Kerry suited up while Chimpy weasled out.