Yes, that's certainly possible. I have found things in Wikipedia that seemed interesting at the time, and then went back to get more detail a day or two later, and discovered whole passages had simply disappeared.

                         This is what it says:

    Canada did not fight in the Vietnam War, and diplomatically it was officially "non-belligerent". The country's troop deployments to Vietnam were limited to a small number of peacekeeping forces in 1973.[1]