Answer: related to death and survival.
Explanation: In the story "The Things They Carried," the detail that contributes to the mood of uneasiness at the beginning is the description of the soldiers carrying various items that are related to death and survival. These items include M-16 rifles, flak jackets, and various personal items such as photographs, letters, and mementos. The fact that the soldiers are carrying these items with them as they go to war creates a sense of uneasiness and foreboding about the dangers and uncertainties that lie ahead.