He was particularly interested in a suggestion by Dr. Hynek that Mantell could have misidentified a United States Navy Skyhook weather balloon .
Having rejected the Venus explanation , Captain Ruppelt began to research other explanations for the incident .
Ruppelt was particularly interested in a suggestion by Dr. Hynek that Mantell could have misidentified a United States Navy Skyhook weather balloon .
Having rejected the Venus explanation , Captain Ruppelt began to research other explanations for the incident .