"They're everywhere!"

— Sierra Delta's reaction when seeing the Russian invaders.

Sierra Delta was the early warning station for the Washington, D.C. area in the level "Wolverines!" in Call of Duty: Modern Warfare 2. Sierra Delta is the codename for the Air Traffic Control.

Call of Duty: Modern Warfare 2Edit

The North American Aerospace Defense Command (NORAD) was checking on stations about seeing "bogeys" (brevity code for unidentified aircraft) entering U.S airspace, but the station responded that their scopes were clear. When NORAD checked on Sierra Delta, the Air Traffic Controller reported fighter jets over highway I-95, the main East-Coast highway (an important strategic asset).

Only Sierra Delta had been engaged. The Russians cracked the ACS module from the fallen satellite in Kazakhstan and were able to hack in the U.S. radar systems. With this technology, they imitated a massive attack on the West Coast when they were actually attacking from the East.

TriviaEdit

• While NORAD addresses them as Sierra Delta, should subtitles be turned on, the response will read "Air Traffic Control".