Wow this one was an eye-opener - a British account that explored the South American psyche. Not particularly focusing on the naval, or air, giving fascinating details of the small unit actions - platoon and company detail of the land battles. The "unofficial" implies heavy hitting, carrying heavy political weight and criticism (see below, a flavour of the South American perspective is shown on the front cover):
A real gem for detail and an alternative perspective. A good read to recommend!
https://en.wikipedia.org/wiki/Hugh_Bicheno