12/31/2007. Remarks by Johan Visschedijk
: "First of two AWACS prototypes, 71-1407
was first flown on February 9, 1972. Above it is pictured about to hook up to the NKC-135A 55-3135
from the 4950th Test Wing at Edwards AFB. After completing testing the two EC-137Ds were brought up to production standard and redesignated E-3A Sentry, later they were converted to E-3Bs."