Then what's the difference between total quarantine and major lockdown?

Id assume, that the differences between minor lockdown, major lockdown and total lockdown (quarantine) are the same as for minor/major/total in every other context too. Minor x = a small quantity of all possible x, major x = a large quantity of all possible x, total x = all of all possible x. X in the given context would then be something like "measures to achieve isolation (on different levels) to decrease infection rate".

Practical example: Minor lockdown could be shutting down public places and canceling events that attract large crowds (>1000 people). Major lockdown could be shutting down all public places and closing borders. Total lockdown would be complete isolation of all individual people, as far as possible, for example via curfews and special protocols like for example (as they did in China) mailmen dropping packages on the doorstep instead of handing them over to you, and similar protocol changes to avoid direct contact between people. — And these three steps are in fact exactly what has been done or is in the process of being implemented right now in many countries.

and France

and spain

and Austria: https://fm4.orf.at/stories/3000031/

Germany is close, they just announce new measures bit by bit every day. Next step not unlikely to be total quarantine.

Switzerland is in state of emergency since today, it's great because they can deploy military to help.

It's not even close to the intense measures in Italy or Spain (for example), however. There's a good bit of discontent about that among people I talk to in Switzerland, but there's no good option so that's expected whatever they decide.

Does that assume the military is immune from the virus?

And parts of the US

Parts of the US have total quarantine? Which parts?