Top Gun Wiki
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Radar Intercept Officer (RIO) is a Naval Flight Officer who occupies the rear seat of such aircraft as the F-4 Phantom II and the F-14 Tomcat . Five characters in Top Gun were RIOs:

The modern-day equivalent of the RIO is the weapon systems officer, who is the backseater in the U.S. Marine Corps' F/A-18D Hornet and the U.S. Navy's F/A-18F Super Hornet. WSOs are depicted in Top Gun: Maverick.

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