Gold tags are those from enemies, whereas red tags are those from your own team. Players can collect tags from their downed allies to "deny" a confirmed kill from the opposing squad. The tags quickly become bait for teams, lying in wait for enemies to rush toward golden tags only to pick them off and collect both sets for a confirm and deny score. Other additions to Modern Warfare 3 include a more robust Private Match mode, which allows players to control multiple options similar to Halo's Custom Match mode. This will allow players to make a number of tweaks to games to create their own gametypes and share the details via Call of Duty Elite as "User Generated" content with friends around the globe. According to Infinity Ward's Robert Bowling, Call of Duty: Modern Warfare 3 will ship with 16 multiplayer maps, each of which will be playable in the game's co-op 'Survival' mode (as seen below).
Dog tags from Modern Warfare 3's Kill Confirmed mode