All the cadets in his squadron were sworn to secrecy and rehearsed in the dead of night on the auxiliary parade-ground.
When Yossarian plugged his headset into one of the auxiliary jackboxes, the two gunners in the rear section of the plane were both singing ’La Cucaracha.’
’I’m going to tell him,’ Clevinger insisted, as the two of them sat high in the reviewing stands looking down on the auxiliary paradeground at Lieutenant Scheisskopf raging back and forth like a beardless Lear.
There are no more uses of "auxiliary" in the book.
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We have an auxiliary power system in case of a blackout.