People tend to think of military science in terms of guns, bombs and high-tech gear. The far more interesting challenge of combat is not how to kill people but how to keep them alive (and put them back together). From a former wedding gown designer who now makes bomb suits, to heat stroke experimenters studying the science of sweat, Mary Roach gains insights into the fascinating figures of military science, including the sleep deprived crew of a nuclear submarine and the scientists using crash-test dummies for army tanks. The people I meet are the militarys unsung heroes, Roach says, So Im singing em.