The OODA loop is today a working part of every military line officer's vocabulary, there has hardly been an article written in a military journal in the last ten years which does not assume that the reader is totally familiar with the concept.
To read about someone who totally understood the the OODA loop a century and a half ago, read any biography of Confederate General Nathan Bedford Forrest, who consistantly whipped the Yankees in Tennessee while outnumbered and outgunned.