1) Enlistment official 2) Provider 3) Slot filler 4) Supplier 1) Headhunter 2) Scout 
• (n.) One who, or that which, recruits.
Re·cruit'er noun One who, or that which, recruits. 
(1) A headhunter. (2) A person who works for a game company and whose job it is to find and entice employee candidates to join the company.
[n] - someone who supplies members or employees 2. [n] - an official who enlists personnel for military service
noun an official who enlists personnel for military service