It's not how much you cut as it is what you cut. If you abandon the farce in Afghanistan and pulled out completely by the end of the year, then that you save billions. If you close down most overseas bases, that would save a lot of money. You can save money be shedding excess administrative fat in the military's structure and ending some missions. The last thing you should cut is actual combat force structure. Even then there are choices that can be made. How many warheads do you want to put on a SLBM? We can actually carry our entire allowed New START nuclear weapon force on 9 Ohio missile subs with room left over. How many Ohio replacements do we need to buy? There are trade-offs than can be made between bombers and carriers.