I can give the perspective of someone who transitioned out of the Marines.
For me, my military background as an Officer of Marines was a huge asset for both matriculation into a graduate program as well as finding employment afterwards. As someone on the other side of the table now, seeing military experience on a resume immediately pushes the candidate toward the top 25%. Your experience in the military, as well as how well you communicate that experience, is also critical to land opportunities following time in the military. The military does a lot of things for the men and women that serve; the leadership opportunities and life experiences are almost without peer especially at the beginning of a professional career. This fact will help get you in the door of almost any employer, but it still falls on you to show the employer that you are the right candidate for a job. You still need to demonstrate the skills and knowledge required of the position. A machine gunner might be an awesome person, but they still need to have a profile that fits the needs of the job. This could be lots of things: education requirement, familiarity with a tool or technology, experience in the field, etc. A combat cameraman has a great profile that fits the needs of a freelance photographer, but, if they were to try to be a firefighter, an accountant, a management consultant, or a Pilates instructor, then they would need to fulfill the additional requirements of the position. Doing so on top of military experience will almost guarantee the candidate to be one of the best applicants.
As for your question about combinations, the answer is it depends. If you were to try and get into photography, then a combat cameraman (which is an enlisted job) is going to be more sought after than a Public Affairs Officer. If you wanted to be an ethical hacker, then a data Marine MOS is going to be better than a Communications officer. None of these are insurmountable, but, when you get to specific cases, there isn't a universal truth than a Naval Officer is superior to Soldier or vice versa.
I hope that helps.