No. 3 - Titan II![]() Titan II was the longest-serving ICBM (Intercontinental Ballistic Missile) in the U.S. Air Force strategic arsenal. As if that weren't enough, the Titan II launched the Gemini missions into space.
And it's not done serving yet. An extensive life-extension program is under way to keep the missiles safe, secure and reliable well into the 21st century.
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