I Knew It!: Several of Clancy's theories, such as high ammunition expenditure and attack helicopters being surprisingly vulnerable, were later proven correct during the various conflicts in the Middle East.
The "F-19 Frisbee stealth fighter". Clancy fell hook, line, and sinker for a fake description of the rumored stealth fighter's appearance and capabilities leaked by the Pentagon to conceal the real engineering principles behind the actual F-117 Nighthawk.
NATO at the time had caught wind of a ZSU-30 antiaircraft gun, and had thought it to be a gatling-type antiaircraft gun, in which role it features in the novel. In actuality, the Soviet 30mm antiaircraft gun would be the 9K22 Tunguska—not a rotary-cannon design at all.