Don't get time to read half as many of these books as I would like, but 3 which I have managed to read and found particularly interesting are
Winged Victory: The Recollections of Two Royal Air Force Leaders by AVM 'Johnnie' Johnson and Wg Cdr 'Laddie' Lucas - a very good read about 2 wartime fighter pilots, their experiences from attempting to join up as aircrew through to combat ops and then as senior officers. A very enjoyable and easy read, yet one that is also very thoughtful and does leave you wondering how some of today's leaders would have coped in their shoes.
Secret Empire: Eisenhower, The CIA and the Hidden Story of America's Space Espionage - tells the story of the development of not only satellite-based espionage, but also of interest was the story of how the U2 was developed.
Most Dangerous Enemy - so you think you know the story of the Battle of Britain? Whilst Susannah York in all her glory provides a great deal of emjoyment, there's an awful lot more to this prolonged action than is usually brought up. For example, it tells the story of one side being a bunch of gifted amateurs, chivalrous, romantic and daring, whilst the other side was a bunch of hard nosed, professional, calculating fighters. But which was the RAF and which was the Luftwaffe???