First, the library book Hunting Eichmann which deals with the search for, capture of, and trial of Adolph Eichmann, one of the key bureaucrats in the SS of Hitler's Germany, who was caught hiding in Argentina by Mossad agents after WWII. Well-written, full of interesting detail.
Second was Osprey Men-at-Arms #470: Roman Centurions 753 - 31 BC: Teh Kingdom and the Age of Consuls, which did a fair job of keeping me interested in the topic.
Then, Osprey Raid #2: Israel's Lightning Strike: The Raid on Entebbe 1976, very interesting read as it details much about the history of terrorists and airline hijackings.
Finally, for now, anyway, was Osprey Men-at-Arms #2: The Arab Legion which details the history of the British training of, and use of what became the Jordanian military.