'There are various types of "contractors"...'
Contracting for the daily affairs of the military is one among them, and it does not necessarily involve participating in combat.
All the service projects in this public area are completed by 'contractors'.
For instance, contracting a barbershop is quite straightforward...
No matter how many people you have, as long as you establish good relations with the base leader and promise to cut the hair of the soldiers on base once a month, you can gain the operating rights.
As for how to make a profit, that's up to you.
The barbershop contractor at the base is a Thai, who sounds effeminate when speaking but is definitely sharp-minded. If haircuts aren't profitable, he helps mercenaries trim their beards and massages them.
He brought over a few masseuses from his hometown and scraped up a hefty profit by skirting legality.
