[BC] Usefulness of EAS

[Ed Czarnecki]

FWIW, by the late 1950s the state of the art was already migrating to
missiles with inertial guidance systems.  Around 1957 or so, we were already
estimateing that the Soviets were using combined radio-inertial guidance
systems for the first ICBMs, and would migrate to inertial guidance systems
by 1960.  Also, the intermediate range SS-4 and SS-5 missiles they placed
into Cuba in `62 already had inertial guidance systems onboard.  Also, it
was believed the Soviet aircraft navigation systems were advanced enough to
support precision targeting without radio-homing.  So, from the late 50s and
into the 60s, planners were already looking at a two pronged threat, from
nuclear armed aircraft, long range, and even short range missiles.  

Whether or not advancing enemy technical capabilities played significantly
into the decision making to upgrade Conelrad to EBS in 1963, I'm not sure.
But, by the late 50s, radio direction finding was already pretty much taking
second seat in favor more advanced nav systems on enemy systems.