"Milo, I forbid you to fly any more combat missions," Colonel Cathcart declared in a tone of stern and inflexible authority.
There were strands of enlisted men molded in a curve around the three officers, as inflexible as lumps of wood, and four idle gravediggers in streaked fatigues lounging indifferently on spades near the shocking, incongruous heap of loose copperred earth.
There are no more uses of "inflexible" in the book.
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They accused her of being stubborn and inflexible.