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Overall view of the inside wall of the booster.

Note the alcohol fill and drain valve at the 10:00 position, the LOX fill and drain valve at 8:00, and the LOX vent at 7:00.

Note many of the 20 connecting brackets on the forward ring frame of the tail unit which connect the tail unit to the center unit. At the 9:00 position is a shiny steel pad to which the engine would bolt; another, darker pad appears at 6:00.