Certainly not the first time
During WWII, Dennis Wheatley was an advisor to the War Ministry and wrote a paper, 'Resistance to Invasion' (May 1940), on how Germany might attack Britain and other countries. I remember reading it in the preface of a later edition of one of his novels, but I don't recall which one at present (perhaps 'The Scarlet Impostor').
Sources:
1. http://ftvdb.bfi.org.uk/sift/title/504925?view=synopsis
2. http://findarticles.com/p/articles/mi_qn4159/is_20061029/ai_n16812265
Biting the hand that feeds IT
