The historians can’t seem to settle whether to call this one "The Third Space War" (or the fourth), or whether "The First Interstellar War" fits it better. We just call it “The Bug War." Everything up to then and still later were "incidents," "patrols," or "police actions." However, you are just as dead if you buy the farm in an "incident" as you are if you buy it in a declared war...
In one of Robert A. Heinlein’s most controversial bestsellers, a recruit of the future goes through the toughest boot camp in the Universe—and into battle with the Terran Mobile Infantry against mankind’s most alarming enemy.
First came the news that a flying saucer had landed in
           Except that two agents of the most secret intelligence agency in the
           Sam Cavanaugh was one of the agents who discovered the truth. Unfortunately, that was just before he was taken over by one of the aliens and began working for the invaders, with no will of his own. And he has just learned that a high official in the Treasury Department is now under control of the aliens. Since the Treasury Department includes the Secret Service, which safeguards the President of the
First published in 1955, this classic thriller of the ultimate alien invasion and the triumph of the human spirit over an invisible enemy inspired three major motion pictures.
First published in 1955, this classic thriller of the ultimate alien invasion and the triumph of the human spirit over an invisible enemy inspired three major motion pictures.