PERU, Ind. — A Cold War relic used by the U.S. Air Force is being showcased at the Grissom Air Museum in its newest exhibit documenting the unique history of Indiana’s Grissom Air Reserve Base.

The Kokomo Tribune reports that the rocket sled is an obscure piece of military equipment used to test an ejection-rescue system for the B-58 Hustler bomber plane.

Museum Board Member Tom Kelly says the B-58 Hustler’s performance capabilities presented issues because the crew was at risk of being killed if they had to eject using a conventional ejection system.

Engineers tested the rocket sled by accelerating to supersonic speeds and launching a fully pressurized capsule into the sky. Kelly says those tests eventually led to a working ejection system for the bomber plane.

Information from: Kokomo Tribune,