Chance of employment (sub; Will my career as an officer help my chance?)

I am currently studying the international relations in the LSE as an undergraduate.

However, since I have committed the Adam's sin of being a South Korean male, I have to join the military for at least 2 years.

I concluded that if I am to be doing this, I thought I would better make the best out of it, thus I will be joining as an officer which will enforce me to do 3 years long service.

I am considering either the navy or the marine corps, so it will be one between those 2.

During my service, I will be applying for my postgraduate studies in preferably Oxford, or LSE.

There are 2 main questions.

1. Given that I graduate LSE with Two-one or above, and do my postgraduate in LSE or Oxford, am I running as a strong candidate in the British job market?

2. How much would my 3 years long military experience as an officer help me in the job market?

Thank you.