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The Lockheed Martin Atlas III was an American orbital launch vehicle, used between 2000 and 2005.〔 (【引用サイトリンク】title=Atlas IIIA ) 〕 It was the first member of the Atlas family since the Atlas A to feature a "normal" staging method, compared to the previous Atlas family members, which were equipped with jettisonable engines on the first (sustainer) stage. == Description == The Atlas III consisted of two stages. The first stage was new, but the upper stage was the Centaur, which is still in use today on the Atlas V EELV. The first stage engines were Russian RD-180s, which are also used by the Atlas V. The Atlas III was produced in two versions. The baseline was the Atlas IIIA, but the Atlas IIIB, featuring a twin-engine version of the Centaur upper stage, was also produced.〔 Early references to the rocket referred to it as the Atlas IIAR. 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「Atlas III」の詳細全文を読む スポンサード リンク
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