Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Graphite-Epoxy Motor (GEM) is a high-performance, solid rocket motor, used for supplemental thrust on several launch vehicles, including the Boeing Delta II and Delta IV. They are designed to allow launch vehicles to deliver larger payloads to orbit. The name "Graphite-Epoxy Motor" refers specifically to solid motors produced by Alliant Techsystems, although boosters of similar construction are used on other launch vehicles.

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