Dammit, I was wrong. In a recent post I thought that those images were game assets and part of the game but it turns out they were MW3 Collectible Training Cards.
They come in different “series”, each featuring a Character, Weapon, Map, Perk and Strike Package.
Character Captain John Price (EPIC BEARD!)
Strike Package Assault
Character Major Sergeant Sandman
Strike Package Support
Character Vladimir Makarov
Weapon ACR 6.8
Strike Package Specialist
Every time you enter a Double XP code, you’ll receive one card.
Source Digital Warfare 24/7