After rollback of the Rotating Service Structure Space Shuttle Discovery stands ready for launch of mission STS-92.

After rollback of the Rotating Service Structure in the early morning hours, Space Shuttle Discovery stands ready for launch of mission STS-92. Above the external tank can be seen the Gaseous Oxygen Vent Arm with its vent hood, commonly referred to as the “beanie cap.” The system is designed to vent gaseous oxygen vapors away from the Shuttle after cryogenic loading. The scheduled launch is the second attempt after an earlier scrub. STS-92 is making the fifth flight for construction of the International Space Station. The mission is also the 100th in the history of the Shuttle program