Is there a benefit to a pilot/aviator having an FCC GROL license? I am an avionics technician (c-130) in the USAF and plan on learning to fly helicopters when I separate in about a year.

I have debated whether or not to pursue a GROL or possibly A&amp;P.  From what I know, these are generally intended for maintainers/technicians rather than aviators.

That said, would there be any benefit to having a GROL or related license for an aspiring helicopter pilot?
There's no tangible benefit to having a GROL in getting a pilots license of any kind as getting the license generally confers the right to use aircraft radios. In some places you need to get an RT license for aviation as a separate test, however that's pretty minimal. A GROL is only good for repairing, maintaining, and running certain types of radio stations. 

An A&amp;P will let you work on airplanes, but it also does not help get a license. An A&amp;P will give you insights into how an airplane works, but you can get those insights without an A&amp;P. Having an A&amp;P and a pilots license might be a different story if you plan to work in remote locations where being able to fix your aircraft when it breaks is useful. It won't help you get a flying job in most places.