Link.
Boston Herald on October 14, 1979:
In fact, I remember spending Christmas Day of 1968 five miles across the Cambodian border being shot at by our South Vietnamese Allies who were drunk and celebrating Christmas. The absurdity of almost being killed by our own allies in a country in which President Nixon claimed there were no American troops was very real.
Unfortunately, the Herald's archives don't go back that far, but fortunately Glenn at Instapundit has done the legwork that newspapers should be doing.
Please note that not one single sentence in this statement is factual.