Boeing E-6 Mercury airborne command post

The Boeing E-6 Mercury is an American military aircraft. It operates as an airborne command post and communications center, relaying instructions from the National Command Authority. Its role in relaying to the fleet ballistic missile submarines gives one of its missions the acronym TACAMO ("Take Charge and Move Out").

Codenamed Looking Glass, it is USSTRATCOM's Airborne Command Post, designed to take over in case NORAD's Cheyenne Mountain Operations Center is destroyed or incapable of communicating with strategic forces. The term 'looking glass' means the same as 'mirror', and is used because it "mirrors" the abilities of Cheyenne Mountain to control nuclear forces.