Curiously, during the launch & flight into orbit scene in the movie Apollo 13, you can hear the CapCom advise "We see your BPC is clear" prior to 'Lovell' jettisoning the Tower.

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"I'd take the awe of understanding over the awe of ignorance any day." - Douglas Adams

"Certainly, in the topsy-turvy world of heavy rock, having a good solid piece of wood in your hand is often useful." - Ian Faith