Basically, yes. Do you honestly think people would have any chance against probably the most powerful army in the world? Sure, they could try fighting a guerilla warfare, they'd even inflict some casualties against the enemy but it's unlikely that in the end they'd succeed against an army that is professional, highly skilled, better equipped, has better offensive and defensive capabilities, knows a lot more about tactics and logistics and has trained for this type of situation on a daily basis.
> Are they going to destroy their own infrastructure?
Would they even consider it their own infrastructure? Or would they consider it infrastructure currently held by rebels, which needs to be either seized or destroyed?
> Do you think the real men and women of the military would follow orders to destroy its own hometowns and families?
I suspect a lot of them would destroy towns if they we're told that these are now enemy bases. This has been repeated in many parts of the world throughout the history, even recent one. If they wouldn't, they'd be defectors and it really wouldn't matter whether the war was fought with modern weapons or sticks and stones.