We understand now that the military was not only involved in Canada but in many other countries around the world.
A possible explanation might be that governments were convinced that COVID-19 was the result of a government-sponsored bioweapons program. They denied any wrong doing publicly but it seems internally they were almost certain that this was the result of their own bioweapons research.
"It would appear that one of their first tasks was the May 2021 memo titled 'Testing Behaviourally-Informed Messaging In Response To Severe Adverse Events Following Immunization' where messaging and communication around COVID-19 vaccine injuries needed to be framed in a way that did not compromise the government's safe and effective marketing slogan."
Update: 2025-03-26
The brownstone institute has an article about the involvment of the CIA and the Military in the US.