Behind the Lines: Corps, Book 7 by W. E. B. Griffin
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World War II. On the island of Mindanao, the Philippines, a man calling himself "General" Fertig has set himself up as a guerrilla leader to harass the Japanese. Army records show that the only officer named Fertig in the Philippines is a reserve lieutenant colonel of the Corps of Engineers, reported MIA on Luzon. Still, the reports filtering out are interesting, and it''s Marine Lieutenant Ken McCoy''s mission to sneak behind the lines and find out if Fertig is for real. With McCoy is a motley group put together as a compromise between the warring factions of Douglas MacArthur and the OSS chief Bill Donovan.