Have a saved game file from Rainbow Six: Vegas or Splinter Cell: Double Agent on 
your hard drive or memory card to unlock extra headgear items unique to each of 
those games available when you customize an online character.
  ICS-PL Helmet: Rainbow Six: Vegas saved game file. 
  J-E FO Helmet: Splinter Cell: Double Agent saved game file. 
  PAS GT Helmet: Rainbow Six: Vegas saved game file. 
  Tactical Shemagh: Splinter Cell: Double Agent saved game file.