NASA Echo Satellite

The NASA Echo satellite - which unfolded from its canister into a 100-foot aluminized balloon to reflect radio signals - mated to the final stage of a Thor-Delta rocket at Cape Canaveral, launch site of the Air Force Missile Test Center (U.S. Air Force Photo).

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Echo 1 was launched on August 12, 1960.

Echo 2 (not on the postcard) was launched on a Thor-Agena rocket in 1964.