NSG, VQ-1
The dome is pure radar receiving antenna, 10 cm maybe.
Reminds one that there is certain unfinished Neptune business on Hainan Island.
One hears of these unarmed flying radio receivers referred to as "spy planes". One remembers that we are talking about a Navy aircraft flying over international waters, totally unsurreptitiously, and no more a spy than any member of our armed forces.
Sure, bygones are bygones, but.......
Those boys flew some serious missions. Either terribly tedious or terribly terrible and not much in between.
One recollects that the Sea of Japan is real cold. Floating ice in the winter.