E-4B – Formerly known as the National Emergency Airborne Command Post (referred to colloquially as "Kneecap"), this aircraft is now referred to as the National Airborne Operations Center (NAOC).
E-4B – Anteriormente coñecido como o National Emergency Airborne Command Post (chamado coloquialmente "Kneecap"), este avión agora coñecese como National Airborne Operations Center (NAOC).