Canada is another country that has effectively become a US military protectorate, along with pretty much the entire of Western Europe.
Don’t see what possible benefit armed forces have for Canada.
If US decides to attack, those forces would do them no good, and the US isn’t going to let anybody else attack Canada.
Possibly some morale and self-respect benefits. Otherwise nada.
You’re right. If you think about Canada doesn’t really need a military, just let the Americans do it.