Service structure

The FSS permitted access to the Shuttle via a retractable arm and a "beanie cap" to capture vented LOX from the external tank.

In 2011 NASA removed both the fixed and rotating service structures from their pad at LC-39B to make way for a new generation of launch vehicles.

[citation needed] Certain rockets such as the Delta and the Saturn V use structures consisting of a fixed portion, formally called the umbilical tower and a mobile portion, which is moved away from the vehicle several hours before launch called mobile service tower/structure.

The white room was the small area used by NASA astronauts to access the spacecraft during human flights up through the Space Shuttle program.

[citation needed] NASA used this room for astronaut final preparations before entering the spacecraft such as donning parachute packs, putting on helmets and detaching portable air conditioning units.