For the Medjay, Nubian nomads, long service alongside the military forces of Egypt became service as a police force in parts of Thebes.  Around 200 B.C. they protected the construction of the royal necropolis at Deir el-Medina.  There they ensured that the workers worked, were kept safe and they even pitched in to help in the construction itself.  Eventually the Medjay people and their culture were totally absorbed by Egypt.