It has been revealed that Modern Warfare 3′s Spec Ops mode will feature a ranking system that will unlock new weapons as you progress.
Infinity Ward’s Robert Bowling confirmed;
“Yes sir, Spec Ops will have its own progressive ranking system allowing you to unlock weapons, gear, killstreaks”
This time round Infinity Ward are really pushing the Spec Ops mode and expanding it from its debut in Modern Warfare 2.
“Spec Ops in MW3 is massive containing some of everything, from missions
to survival mode using MP locations, SP locations, & more,”