Generate a correct and concise answer for the question based on the words in the context.

Context : The Eighth Doctor Adventures (sometimes abbreviated as EDA or referred to as the EDAs) are a series of spin off novels based on the long running BBC science fiction television series Doctor Who and published under the BBC Books imprint.
Question : The Eighth Doctor Adventures is based upon what?
Doctor Who

Context : Power Rangers S.P.D. is an American television series and the thirteenth season of the Power Rangers franchise, based on the Super Sentai series, Tokusou Sentai Dekaranger.
Question : The Power Rangers S.P.D. is based upon what?
Tokusou Sentai Dekaranger

Context : Rear Admiral Thorvald A. Solberg (17 February 1894 -- 16 May 1964) was a senior officer in the United States Navy, and the Chief of the Office of Naval Research from 1948 to 1951.
Question : Which military branch is Thorvald A. Solberg a part of?
United States Navy