STS-3 Credit - NASA

The initial series of shuttle flights were equipped with specially adapted SR-71 ejection seats for the two crew. The crew were provided with space suits, derived from the USAF SR-71 suits, which provided them with some protection in the event of ejection or cabin depressurization. The suit was a modified S1030A with an anti-G system. After the initial flights, and until the Challenger disaster, the crew was provided only with oxygen masks.