What is the fine-grained topic of the following text: On May 19, John “Tig” Tiegen, veteran of the U.S. military and Central Intelligence Agency (CIA) and contributor to the New York Times bestselling book, 13 Hours: The Inside Account of What Really Happened in Benghazi, shared his intense story about saving lives, the ensuing mental challenges, and his journey back to stronger mental health. Only return the topic.
John "Tig" Tiegen's experiences and journey to mental health after the Benghazi incident.