Only a year (my 1st as a Navy pilot) was spent flying the "early warning routes" , referred to as the North Altantic Barrier. That was an airborne extension of the DEW line which stretched across Canada, Greenland, Iceland, to the Faroe Islands, Scotland, and Norway.
Most of my Connie time was doing electronics countermeasures flying.
Flying various perimeter areas of the Soviet Union, Eastern Bloc countries, North Korea, Cuba, Israel/Egypt, and North Vietnam. We operated from random world wide sites, and sometimes flew without any flight plan, to avoid giving away our location.
A combination of boring, scary, and fun!
A Connie was shot down, over water, by the North Koreans on April 15th 1969, with all hands lost (31). The aircraft commander was a good friend of mine, with whom I had flown many times.
We used a crew of up to 30, monitoring/recording electronic signals and voice.
We also did NASA missile launch/recovery telemetry support.