Because he didn’t want to go back home to his family and the others
The main goal of Flying Tigers was to composed pilots from the United States Army Air Corps, Navy and Marine Corps.
They chose to create the declaration of independence because the English were being oppressive toward the new colonies. Since they didn't like it the created the document to break free of the English to be able to fight them. Even though there was already bloodshed they wanted to end that.
Temperature, food, pollutants, population density, sound, light, and parasites.
Milk would likely be your answer