I knew that the first Halo had a health pack, and Halo Reach as well. Since Teddy doesn't wear Spartan Armor, he'll have a med-kit instead. The dark gray tiles are for instruction for the injector, the white vial is morphine(To heal injuries), the yellow vial is adrenaline(to get your body moving), and the blue vial is tranquil(to put the injured soldier asleep). Hope this helps your curiosity.