Common Core Booster
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Common Core Booster (CCB) is the modular liquid fuelled first stage of the Atlas V expendable launch system. In most configurations a single CCB is used with strap-on solid rocket boosters. For heavier loads three CCBs can be strapped together in the first stage. The Common Core Booster utilizes the Russian designed RD-180 (rocket engine) burning RP-1 fuel with liquid oxygen producing a thrust of 4.15 MN
A similar design is used in the Delta IV rocket. One or three liquid fuel modules can be used as the first stage. The Delta module is called the Common Booster Core (CBC). It uses the Rocketdyne RS-68 engine and burns liquid hydrogen with liquid oxygen producing a thrust of 2.9 MN.