The budget for military recruiting exceeds $4 billion per year.  That amount includes $1.5 billion in advertising and maintaining the recruiting stations, and the pay and benefits of more than 22,000 military recruiters.  Enlistment bonuses (used to attract new recruits) in the active-duty Army alone amounted to $166 million.

Source: Department of Defense, Operations and Maintenance Budget, FY2007 and earlier years, and Department of Defense Recruiting Assessment.