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Overall view of the first stage's S-3D rocket engine (the Thor variant was also known as the MB-3).

The engine could gimbal; it appears that there's a bracket to hold the engine in place and a plate on the missile's aft face to protect the engine compartment interior.

Delta Thor MB-3/S-3D rocket engine at Goddard Space Flight Center
Time picture taken Wed Jun 27 12:21:04 2007
Location picture taken Rocket Garden
Visitor Center
Goddard Space Flight Center
Greenbelt, MD
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