Instapundit passes on this Atlantic article which Steve Green calls the most important read of the year. I don't know as I'd go quite that far. The first part deals with rereading Vietnam, a summary of important but neglected books, including many on the second half of the war, about which little has been written.
The piece then expands to discuss other writers, not all American, about the frustration and moral difficulties of guerrilla and counterinsurgency warfare. Read to the end or you miss important points.