What is the designation of the Mercury airborne command post aircraft?

The designation of the Mercury airborne command post aircraft is E-6B. The E-6B is a type of military aircraft used by the United States Navy primarily for command, control, and communications missions. It serves as an airborne platform for the National Command Authority, facilitating communication with U.S. military forces, especially in the event of a nuclear conflict.

The E-6B is equipped with advanced technology that allows it to relay instructions and commands to fleet ballistic missile submarines. It plays a crucial role in the U.S. military's strategic deterrence and global command and control strategies, acting as a vital link in the chain of command.

The other aircraft listed serve different roles: the EP-3E is primarily used for signals reconnaissance, the EA-6B is designed for electronic warfare, and the F/A-18E/F is a multirole fighter jet. Each has specific capabilities that support various military operations but do not fulfill the command post function that the E-6B performs.