What was the dress rehearsal for ww2 that demonstrates the destructive power of modern warfare?

Fun Fact: Hitler was involved in the Spanish Civil War. Adolf Hitler sent Air and Armored units to assist with the Spanish Nationalist during the war. The war was also a great testing ground for Hitler's new weapons which would soon lead to the 2nd world war.

Based on what you know about Stanley's family, environment, and beliefs, what can you tell about his identity?