Joining the Navy after completing my degree?

[colum]

I am currently in my 3rd year in Commerce. Majoring in Marketing, International Business and Commercial Law. However, after completing my degree, I am planning on enlisting for the Navy. How would this affect my business career? I am 20 years old (will be in my early-22 when I complete), and if I get accepted in the Navy, I will stay for 4-5 years maybe (29-30) when I get out.

I am also currently working in a marketing position, so I can say I have some experience when I look for a job again?