What is the setting (when and where)for "In the fields"

They are in the fields of Vietnam. The morning after Kiowa is killed, all 18 soldiers begin to search for Kiowa’s body in the shit field at daybreak. Lieutenant Jimmy Cross leads the search in the rain. The soldiers all want to be somewhere else, but they feel it isn't right to leave Kiowa in the field. While the men search for the body, Cross thinks about the letter he will write to Kiowa’s father breaking the news of the death. He will write about what a splendid soldier Kiowa was...