All 3 Uses

spontaneous
in
Flags of Our Fathers
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Genaust had gotten the footage he wanted: a routine, spontaneous color sequence of the replacement flagraising.†
Chpt 11. *

spontaneous = behaving in an instinctive, uninhibited manner OR happening naturally (without planning or external force)
The boys, refusing to go along with the hyperbole, fired back that "the picture was entirely spontaneous."†
Chpt 16.
At 5:55 A.M. he made a spontaneous loop around Mount Suribachi as he waited for two other B-29's to catch up with him.†
Chpt 17.

Definitions:

(1) (spontaneous)
happening naturally, suddenly, or without outside planning or action
(2) (meaning too rare to warrant focus)