Eddy,
To be a loadmaster you need to be able to load plan based on aircraft structurals & dimensions and be able to compile a loadsheet.
Unlike a pilot or a flight engineer there are no similar training or qualifications required to be a loadmaster and this leaves the door open to hundreds of applications for a single job.
I wouldn't tell your friend to enter a military career in the belief that he will be able to resume that career in civvie street upon leaving the military, civilian aviation is a big tough world, just ask all the young & licenced pilots in the wannabees forum, and to get a flying job, particularly a less qualified one, well he's. literally, going to have to be one in a million.