Should females be allowed to serve in combat jobs typically filled by males in the US military?
Yes. If they are as competent as men, and want to serve, yes. Don't lower the standards for women just to include them in the military, because they are on the front lines and could potentially get killed.
Yes. Yes. Yes.
Also, if they are allowed to do so voluntarily in times without a draft, they should also be required to do so involuntarily in times with a draft (assuming the draft cannot be done away with, which I'd much rather prefer)