Premise: James Forbes Chapin ( ) (July 23, 1919 – July 4, 2009) was an American jazz drummer and the author of popular texts on jazz drumming, the first two volumes of which are "Advanced Techniques for the Modern Drummer, Vol. I," and "Advanced Techniques for the Modern Drummer, Vol. II." (A third volume is planned.)
Hypothesis: James Forbes Chapin served in World War II.