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SAC also proposed an Advanced Airborne Command Post based on the C-5A in 1963-1964 - even by then it was apparent that the EC-135 was too small for the job. It seems to have been envisaged as filling the SILK PURSE and BLUE EAGLE missions as well as LOOKING GLASS and NEACP.Ultimately the expense of the project and the C-5A's problems delayed it until the early 1970s, when the 747 looked like a better bet. The E-4 was the result, though only built in sufficient quantity for the NEACP mission.http://www.alternatewars.com/WW3/WW3_Documents/US_Misc/S-467_US_C3I_45-72_Pt3.htm
SAC also proposed an Advanced Airborne Command Post based on the C-5A in 1963-1964 - even by then it was apparent that the EC-135 was too small for the job. It seems to have been envisaged as filling the SILK PURSE and BLUE EAGLE missions as well as LOOKING GLASS and NEACP.
Ultimately the expense of the project and the C-5A's problems delayed it until the early 1970s, when the 747 looked like a better bet. The E-4 was the result, though only built in sufficient quantity for the NEACP mission.
http://www.alternatewars.com/WW3/WW3_Documents/US_Misc/S-467_US_C3I_45-72_Pt3.htm
