A Delta IV rocket lifts off here. According to Peter B. Teets, undersecretary of the Air Force and director of the national reconnaissance office, access to space is better than ever before, but increased reliance on space-based assets means the nation must look to the next generation of evolved expendable launch vehicles to replace current systems like the Delta IV and the Atlas V rockets.

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A Delta IV rocket lifts off here. According to Peter B. Teets, undersecretary of the Air Force and director of the national reconnaissance office, access to space is better than ever before, but increased reliance on space-based assets means the nation must look to the next generation of evolved expendable launch vehicles to replace current systems like the Delta IV and the Atlas V rockets.

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