Who was involved in an espionage case known for being a U.S. Navy sailor?

The correct choice involves Kun Shan Chun, a U.S. Navy sailor who was arrested for spying for the People’s Republic of China. Chun’s case is notable because it highlights the vulnerabilities present within the military and intelligence community when insiders provide sensitive information to foreign adversaries. His actions had significant implications for national security, as he allegedly transmitted critical naval intelligence.

In contrast, Robert Hanssen is known for his espionage work as an FBI agent who spied for the Soviet Union and later Russia, and Aldrich Ames is a former CIA officer who provided information to the Soviets. John Walker was a U.S. Navy officer who also engaged in espionage, but he was not specifically referred to as a case of a U.S. Navy sailor as prominently as Chun's. Therefore, focusing on Chun emphasizes not just the act of espionage but also the context of a military background and the consequences that arise when individuals exploit their positions for espionage.