Universe Destroyers: World War 2. Universe Destroyers, #1.1

A saucer-like disc crashes at Cape Girardeau and four abnormally small, gray bodies of beings possessing featureless faces are discovered by authorities. Few people know that a juvenile survivor of the wreck was recovered by US authorities and was shipped to Washington, D. C. for study. The forces of darkness are aware of the existence of the alien, its incredible capabilities, and the technology that it had crashed to the Earth with.
Every rival from the Soviet Union to Hitler's Nazi Germany craves access to the creature. When the juvenile alien goes missing from the White House bunker, all seems lost. President Roosevelt sends an elite unit of commandos to penetrate Peenemunde and bring the juvenile alien back to the United States.  Readers will be fascinated by the technology, intrigued by the history, and thrilled by the nonstop adventure.