Dear Isaac - the F-103 , F-107 , F-108 were not entered service and only the 107 flew while the other two stayed on mockups status. The 107 lose to the 105.
For a brief period the Phantom was called F-110 Specter but it was changed back to F-4C by USAF.
Also let us not forget the F-111 swing wing fighter bomber.
Yair
Yair
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