KC4USV station call sign is for A) McMurdo B) Amundsen Scott … Both located in the Antarctic and both are research stations operated by the US….
B. Amundsen Scott
Answer A… McMurdo, located on the south tip of Ross Island, which is in the New Zealand–claimed Ross Dependency on the shore of McMurdo Sound in Antarctica. Amundsen Scott (known as Scott) call sign is KC4AAA and KC4USN is located at the southernmost end of the Earth, the Geographic South Pole.
More info Amundsen Scott… DX News.com … Wikipedia … Station Video from 2013 below