Jim Hennesey, spokesman for The Sarens Group, explains the Endeavour's journey.
The Sarens Group teamed up with Toyota to create the dolly used to haul the US space shuttle through the streets of Los Angeles.
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Seventeen people – including nine members of the same family – were killed in the accident.
A group of MPs and peers has said the roll-out of the project should be reviewed immediately.
The ex-combatants were sworn in on Friday.