Boeing E-4 Advanced Airborne Command Post (AACP)- 1974~present
- United States Air Force (USAF)
- a strategic command & control military aircraft
- modified from the Boeing 747-200B for the National Emergency Airborne Command Post (NEACP) program
- four E-4B (3 upgraded from E-4A) are operated by 1st Airborne Command and Control Squadron of 595th Command and Control Group
- E-4B - equipped with 52,500-lb CF6-50E2 engines. Has nuclear electromagnetic pulse protection, nuclear and thermal effects shielding, advanced electronics, and a wide variety of communications equipment.
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