I talked to the Marine Corps recruiter and asked for a job in a Communications. He fulfilled my request and wrote my contract for Field Radio Operator. He told me at that time that this job would be good for me after I get out of the military, and he was right. This Job taught how to work under pressure and other technical and soft skills that I could carry over into the civilian sector.
Go see a recruiter, they will give a list of all the information they need. Make sure to disclose all legal matters upfront. You also need paperwork on any medical issues.
I applied in-person. The process took 1+ week. I interviewed at US Marine Corps (Chicago, IL) in Feb 2020
Interview
Interview process was simple and non-exhaustive. Interviewer was polite and wanted to make sure the position was filled with the right talent. Interview process went multiple rounds and was able to speak to employees in the current position and get their take on the position and how they are enjoying it.