What does THFRO mean in Unclassified?

The Hunt for Red October

The Hunt for Red October is the debut novel by American author Tom Clancy, first published on October 1, 1984, by the Naval Institute Press. It depicts Soviet submarine captain Marko Ramius as he seemingly goes rogue with his country's cutting-edge ballistic missile submarine Red October, and marks the first appearance of Clancy's most popular fictional character, Jack Ryan, an analyst working for the Central Intelligence Agency, as he must prove his theory that Ramius had intended to defect to the United States. The Hunt for Red October launched Clancy's successful career as a novelist, especially after then-U.S. President Ronald Reagan remarked that he had enjoyed reading the book. A film adaptation was released on March 2, 1990, and several computer and video games based on the book have been developed. The book was instrumental in bringing the book genre of techno-thriller into the mainstream.

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