'The Moon's a Balloon' and 'Bring on the Empty Horses' by David Niven. Also all the Spike Milligan auto biography books (I think there are 6). Although 'Adolf Hitler:My part in his downfall' is very Milliganesque in terms of humour, by the time you get to 'Where have all the bullets gone?' where he gets shellshock and becomes a manic depressive, the writing style has developed and it is very moving. There are loads of bits that show the futility of war, but more that show that on the whole he had a fun time.