Atlas V 501

An Atlas V, in its '501' configuration with a 5.4-meter-wide (18-foot) payload fairing, no strap-on boosters and a single-engine Centaur upper stage, roars aloft with the National Reconnaissance Office's NROL-41 payload. The RL-10 engine used by the Centaur has been the primary cause of two months of delays. Photo Credit: ULA

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