User blog comment:Callofduty4/Modern Warfare 3 Spec Ops shown at Late Night with Jimmy Fallon/@comment-3394846-20110614201417

Notice the Yellow shield with black lines at the bottom center of the HUD. theres also a number indicator that says "armor" and has the number "100" to the right of the shield. This number goes down when he's shot. Maybe it's a new body armor gameplay mechanic?