If you want to go for Master’s degree then you should opt for Master of Business Administration (MBA) in Operations Management. An MBA in Operations & Logistics would teach you how to drive back-end efficiency. Operations Management is the function of managing the operating core of an organisation: the activities associated with creation, production, distribution and delivery of the organisation's goods & services.
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Since you want to run your own business, MBA in Entrepreneurship is also a good idea.
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Colleges offering MBA in Entrepreneurship
If you want to join AirForce, Indian Navy etc., you have two options. Join in the capacity of an Engineer (which you are pursuing right now) or appear for public service exams like UPSC.
Union Public Service Commission (UPSC) is the central organisations conducts competitive exams for government services under arrangements with the Ministry of Defence for entry to certain Defence Services, through the National Defence Academy, Indian Military Academy, Naval Academy, Air Force Academy and the Officers Training Academy. Civil Services Examination, Combined Defence Services Examination, National Defence Academy Examination and Naval Academy Examination are the examinations conducted by the UPSC.
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You can choose any of the courses according to your interest and aptitude.