They will be going to MCAS Beaufort with all the other Marines Sam, they'll be more than happy to share their birds, and their basing/berthing with the JMSDF...
I can assure you they will be treated with the utmost respect and honor, until they "screw up", and then they will be given "SHIT" just like every other aviator!
I suppose I can guess where you are coming from? but the Marine Aviators are the best in the business, the USMC has made flying Harriers look like a "piece of cake"! they are that good
Flying the F-35 Bravo is a "piece of cake", whoever the JMSDF sends will be highly honored as well as hand picked, they will have it all, talent, talent, and more talent, along with winning attitude and "team spirit"......
I will also personally guarantee that whoever flies and trains with the Marine Aviator's at Beuafort, will look back on that as one of their greatest accomplishments, and probably the greatest time of their lives.
It will be very hard work, lots and lots of study, study, study, did I say study, they will know the airplane inside and out, class room time for hours on end, into the simulator till you don't think you can stand another day, for every procedure and emergency ever dreamed of? drilled over and over and over, and finally out the airplane, which at once will be the greatest adventure ever, and at the same time, a complete anticlimax!
but when they crawl out of that cockpit, the first time, and probably every time in training, they will be wringing wet with sweat, and mentally and physically "wrung out", because flying is a hell of a lot of hard work!