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View of an explosive screw access door (or at least half of the door; the door appears to be hinged, with the lower portion of the door is missing).

Picture 2 of 3.

The center unit and combined aft unit/warhead section were joined during flight by explosive screws; the aft unit had six ball fittings which extended into the compartments in the center unit covered by doors like this, allowing the explosive screws to be installed.