All My Sins Remembered
This book takes the form of linked short stories about a far-future spy. The linking sections deal with his guilt over the actions he has been forced to take by his training in execution of his job, which contradict his internal beliefs.
This is a competently written, entertaining enough little piece. Apparently Haldeman has a large repution, but this is more based on Forever War (which I own but haven’t gotten around to reading yet).