The German scientist, is considered the father of the American space program.

Wernher von Braun

Wernher von Hindenburg

Wernher von Bismarck

Wernher Von Braun

Explanation:

He initially worked for the Germans for rocket technology but later moved on to work for the U.S. and helped them further their space/ rocket technology.

c. troops marched forward in close formation against newer, more accurate weapons