I don't think that this is actually true-- other than the ICRC, the small number of Canadian advisors at the beginning of the war, the small number of Canadian peacekeepers at the end, the extensive number of Canadian volunteers for US military service, and the employees of Canadian defense companies that travelled to Vietnam to support US equipment. There were also some humanitarian civilian missions.
There's tons of newspapers, etc, online from this period. It's hard to believe that no primary nor secondary source would have survived of what you're describing.
If only his page still existed.