Starship Trooper by R.A.H.

Many would have probably either seen the movie, or the animated series on TV (I loved both); the book is slightly different, but totally worth reading (I have to thank Sir Varun Joshi for the recommendation). Written by an ex-army man, this is a thrill ride in book form. Packed with good comraderie, honour, heroism and all the other good stuff, the book is an excellent stimulant, and will leave you "on the bounce".