So sorry about your loss. As a retired veteran, I thank your father for his service. I have a good friend who also served during Korea and have heard some pretty bad horror stories. I hope his service was without any bad issues.
Getting to the watch, It is definitely a valuable heirloom and I agree that you have a certified independent watchmaker handle the service to the watch so you can control what work will be done. I'm sure there are some very well qualified watchmakers out your way that can handle it. I found mine via the jewelry store I purchased my DJ at. Many of the reputable jewelry stores either have a qualified watchmaker on site or local where they send it.
Good luck and where the watch proudly.
