In an interesting twist on the un-lockable content that you usually get in Tom Clancy games, Ubisoft have decided that in Ghost Recon Advanced Warfighter 2 a few items will only be unlocked if you have played previous Ubisoft games, specifically; there are 4 items of headgear that are only usable if you have played Rainbow Six: Vegas or Splinter Cell: Double Agent. If GRAW2 detects a game save for either or both of these games, you will be able to use these funky new pieces of headgear on your Ghost.
If you have neither R6V nor SCDA, you will not be able to unlock any of these 4 items. Having one of either R6V or SCDA and you will be able to use two of these items. Having both R6V and SCDA game saves on your HD will unlock all four of the items.
