If you cross the International Date Line going West, then Christmas is celebrated a month later -- in January, so Kerry was in Cambodia on Christmas Day, January 25, just after Nixon was sworn in and sent secret troops to Cambodia.
Wallah!!!!! it all fits.
lol
Right January 25, 1942, it is seared in his memory. If FDR wants to debate John Kerry's service in Viet Nam, "BRING IT ON!"
he was in Cambodia to celebrate the Orthodox Christmas......