You say in the same breath that you would make service compulsory AND remove billions from the defense budget.
Based on the fact that is impossible I don't see how I could vote for you.
This is possible. Other armies can do it, so the US military can do it as well. Most expensive is the readiness to launch wars anywhere in the world. America doesn´t need that and other things are urgent.
No, not if you are going to pay them in any sort of reasonable manner. If you want to place 2.5-5% of the people in the military (what it would mean if service is mandatory) then you are talking about 3-5 million people at least.
That is a lot of people. Pay them 40K a year and you are looking at 300 billion a year in MANNING costs just including direct pay (and that is at the low end).
And we have not bothered to factor in infrastructure, training and equipment. Healthcare and disability costs (both short and long term) or any of the less direct benefits that are supplied.
IOW, the numbers flush out that such an idea is simply untenable.