Can I join marines or navy after completing a B.Com?

I am afraid that you cannot join Merchant Navy. Only the Science stream students are eligible for job in Merchant Navy. But since you have completed graduation in commerce, it closes all doors for you. The candidate who has completed 12th standard with Physics, Chemistry and Maths is eligible for j

Indian Navy recruits commerce graduates in Logistics Cadre under Short Service Commission and Permanent Commission both. You need to take an examination called CDS (Combined defence service examination) which is conducted by Union Public Service Commission twice in a year. The age limitation is 19-