Again...
Quoted:
Fighting Falcon is the official name, pilots and crews refer to it as Viper, allegedly because of Battlestar Galactica.
Also B1 Lancer > Bone and B52 Stratofortress > BUFF
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http://www.f-16.net/articles_article10.html
Viper: the unofficial nickname
The F-16 is often referred to as the "Viper", a nickname especially popular with people involved with the F-16.
Before "Fighting Falcon" was selected as official name, pilots at Hill AFB, the first F-16 base, came up with a number of proposals, including "Viper".
Lt. Col. Pat "Gums" McAdoo, USAF Ret., one of the first F-16 pilots at Hill AFB, recalls the origin of the name "F-16 Viper":
At end of runway, the F-16 did resemble a cobra or something as it approached you.
However, I think Northrop had already taken that name for the YF-17.
We all voted, and Viper came in really high.
Seems there was a series on TV that had 'colonial Vipers' flying off of Battlestar Galactica (a term later used for the Eagle).
In any case, the Generals didn't want a plane 'named after some snake'!
Falcon was a good name, and it fit in with the motif that the Eagle had created.
Sort of a little brother, but still a 'Bird of Prey'.
In fact, GD had a great promo out in late 70's called "Bird of Prey", and it used the Falcon as the real world model.
Even when F-16 Fighting Falcon became the official name, Viper stuck around and became the unofficial nickname for the F-16.
The name "Viper" is even officially used for the Joe Bill Dreyden "Semper Viper" award, which is awarded for excellent airmanship by F-16 pilots.