As a very long time John Denver fan, I can explain thi for you!!!!!
John Denver (or Henry John Deutchendorf - the name he was born with - but Randy Sparks suggeted that he change this name becasue it would not fit on a 45 record!!!) was the son of one of the very first Air Force pilots - when teh Air Force was formed from the Army Air Corps. John Deutchendorf set 3 air speed records. His call sign was "Dutch". Dutch died in 1982 - was considered to be "lost" when on the ground.