What is the setting in the biography, Marine Sniper?

The setting is not fully established beyond a vague feeling of being in a strange land which is full of insects and plants, and that is hot and wet. For example, from time to time Hathcock relocates from one fire base to another—but they are nearly all indistinguishable from one another and aside from being given a different designation could function interchangeably within the narrative. While this might be essentially true as reflected in the reality of being on the ground in combat at the time, it is derived in the text more through a failure to develop the setting than through a repetitive description.