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The sign accompanying the Shuttle ejection escape suit. It reads

SHUTTLE EJECTION ESCAPE SUIT

Shuttle Ejection Escape Suits were worn by astronauts during the first four shuttle missions (STS-1 through STS-4) while NASA was still testing the safety of the reusable shuttle spacecraft. The pressure suit was based on the U.S. Air Force's S1030 suit worn by SR-71 pilots and would protect the astronaut in case of emergency ejection from the orbiter. It provided oxygen and protection from high-altitude code temperatures.

STS-2 crew members Joe Engle (left) and Richard Truly (right) wearing S1030A Ejection Escape Suits.