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S-IVB
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<p>The S-IVB (pronounced "S-four-B") was the third stage on the <a href="/facts/Saturn_V/WhpUEFJM">Saturn V</a> and second stage on the <a href="/facts/Saturn_IB/gpHk3gcW">Saturn IB</a> launch vehicles. Built by the <a href="/facts/Douglas_Aircraft_Company/vkkFDEhB">Douglas Aircraft Company</a>, it had one <a href="/facts/J-2_(rocket_engine)/oNtBBUD7">J-2</a> rocket engine. For lunar missions it was fired twice: first for Earth orbit insertion after second stage cutoff, and then for <a href="/facts/Translunar_injection/nc16VTrG">translunar injection</a> (TLI). </p>