Hi

If you want to join defence forces computer science engineering would be good.

Indian Navy provides excellent career opportunities in the field of IT.Eligibility criteria-The candidates must possess at least 60% marks in one of the following disciplines

BE/B.Tech (Computer Science/ Computer Engineering/IT)

M.Tech (Computer Science)

M.Sc (Computer)

MCA

There are a number of ways through which the aspirants can join the Indian Armed Forces like University Entry Scheme,TGC,etc

You can check the below link for more detailed information

https://www.google.com/amp/s/www.careers360.com/careers/career-in-defence-after-engineering/amp

Hope this helps.