Having a certification is certianly better than not having one. Whether it will help you specifically or not depends on a lot of things but mostly on the job you are applying for.
I got my CCNP before I retired from the AF and it helped with my first civilian job but I also had Cisco 5500 ATM switch experience which was even more helpful for that particular position.
Either way, there is no cost to you so get whatever certifications you can while someone else is paying for it.