Everybody in the Valley knows that Scavengers are a part of the "Brotherhood" - a military organization, that also includes Steppenwolfs. That's why discipline and strict hierarchy are highly important and beneficial for Scar AB's people. But every career ladder has a downside - its first steps.
Hog has joined the Scavenger ranks just recently, but he has already proven himself to be a responsible worker in the field of finding the useful "junk" and protecting it from hostile gangs. Scar would gladly promote the rookie, but "he has just started working here". Good thing that Hog is a professional mercenary who is only interested in his reward, and Scavengers alwaus pay their debts.