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The Titan IV family (including the IVA and IVB) of space boosters were used by the U.S. Air Force. They were launched from Cape Canaveral Air Force Station, Florida,〔(Titan 4B and Cape Canaveral )〕 and Vandenberg Air Force Base, California.〔(Titan 4B and Vandenberg Air Force Base )〕 At the time of its introduction, the Titan IV was the "largest unmanned space booster used by the Air Force."〔(【引用サイトリンク】title=Titan IV )〕 The Titan IV was the last of the Titan family of rockets. It was retired in 2005 due to its high cost of operation. The final launch (B-30) from Cape Canaveral AFS occurred on April 29, 2005, and the final launch from Vandenberg AFB occurred on October 19, 2005. Lockheed Martin Space Systems built the Titan IVs near Denver, Colorado, under contract to the government.〔 ==Features== The Titan IV was developed to provide assured capability to launch Space Shuttle–class payloads for the Air Force. The Titan IV could be launched with no upper stage, or either of two upper stages, the IUS (Inertial Upper Stage), and the Centaur rocket upper stage. The Titan IV was made up of two large solid-fuel rocket boosters and a two-stage liquid-fueled core. The two storable liquid fuel core stages used Aerozine 50 fuel and nitrogen tetroxide oxidizer. These propellants are hypergolic (ignite on contact) and are liquids at room temperature, so no tank insulation is needed. This allows the launcher to be stored in a ready state for extended periods. However, both propellants are extremely toxic. The Titan IV could be launched from either coast: SLC-40 or 41 at Cape Canaveral Air Force Station near Cocoa Beach, FL and at SLC-4E, at Vandenberg Air Force Base launch sites 60 miles north of Santa Barbara in California. Choice of launch site depended on mission parameters and mission goals. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Titan IV」の詳細全文を読む スポンサード リンク
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