The Rising of the Attack Helicopter (Shield Hero Fanfic)

David McDonnell is a genius US Air Force veteran who is currently working for his family's aviation firm, McDonnell Douglas. He was the main driving force behind many revolutionary designs in his field. What would happen if this expert of modern weaponry was transported to the medieval land of Melromarc? Find out how David decides to deal with the treachery of this land and how he plans to incorporate modern technology and weaponry into this world.