User blog comment:Callofduty4/Modern Warfare 3 Weapon Proficiency and Equipment trailer/@comment-109.155.104.230-20111028162346/@comment-65.199.210.162-20111028163127

Yes, this is true for all 4 prior games (4, WAW, MW2, & BO). If you have prestiged at least once in these games you get one token. Max is obviously 4.

And no, 15 prestiges in BO does not = 15 tokens, one per game