General Dr Hans Friedrich Karl Franz Kammler (August 26, 1901 – May 1945?) was an engineer, high-ranking officer of the SS, and probable member of the Karotechia. He oversaw SS construction projects, and towards the end of World War II was put in charge of the V-2 missile program.
In May 1945, Kammler disappeared. Some reports suggest that he was assassinated by a member of his staff, acting on orders from Himmler not to allow personnel with detailed knowledge of the rocket programme to fall into Allied hands. Others indicate that he may have been killed in action or committed suicide somewhere around Prague. The fact that his exact fate is unknown and that his body was never recovered led to some speculation that he continued his work in the United States after the war, where it is alleged he worked on anti-gravity and other advanced devices.

92 year old Orville Kammler sings in German for nieces (Youtube Description)