The additional prerequisite to join Black Ops Squad is attainment of level 20 with at least one hero.
http://www.battlefieldheroes.com/groups/53159 <-- Click here to apply for BOS.
The requirement for King of the Hill is attainment of level 30.
http://www.battlefieldheroes.com/groups/69236 <-- Click here to apply for King of the Hill.
All applicants to either Black Ops Squad or King of the Hill must, prior to acceptance, be part of at least one Chaos Death Squad main group. (Click here for main groups)
