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History Quiz - week of Feb. 4

SCHRIEVER AIR FORCE BASE, Colo. -- Last week's answer:

What satellite inspired scientists at Johns Hopkins University's Applied Physics Laboratory to develop the idea of using radio signals from space for navigation?  The Soviet Union's Sputnik satellite inspired the idea of using radio signals from satellites for navigation.

This week's question:

What two U.S. Naval Research Laboratory satellite systems provided important advancements contributing to the development of the first GPS satellites?

Responses to the quiz questions can be emailed to the 50th Space Wing History office at 50swhoworkflow@us.af.mil.
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