Is it possible to combine different careers in the military and your promotion will still be guaranteed?

Hi Everyone,

I would like to know the possibilities of having dual careers in the military and still move up the ladder.. If For example, I join the US Army Reserves as a social worker (73A), and I would like my Army civilian job to be a Military HR Specialist, will it guarantee a steady career progression in rank?

Or would it be a good idea to serve as a Social Worker in the reserves and still maintain an army civilian job as a social worker (i.e staying in the same career path) in order to move up the career ladder?

I love both career paths and it would be nice to combine both without one affecting the other and most importantly without affecting promotion