The Forever War (SF Masterworks No1) by Joe Haldeman
(Orion Millennium, £6.99, 254 pages, paperback; first published 1974; this edition published 21 January 1999. Also published as SF Masterworks IX in the hardback version of the series, October 2001. Published as an omnibus edition: Peace and War: The Omnibus Edition comprising The Forever War, Forever Peace and Forever Free; Gollancz, £7.99, 696 pages, paperback