Question about warranties

Hi all, so one of my supposedly tough and military spec watches, my Marathon field watch has gone kaput. After having it on my watch winder and I check it and it's dead.

I opened it up and noticed either the hairspring is uncoiled. I have never had a watch "die" on me before. I only have had the watch for about 6 months. Do I bring it to a local watch maker? Or do I reach out to Marathon directly and work around the warranty thing?

Any help you can supply would be great!