His book was not a best seller in commercial terms, it might be better described as a dud.

Different manufacturers of sub munitions around the world have achieved different levels of dud rates with their sub munitions.

The In Service Surveillance (ISS) program coupled with a regular proof firing program will provide the best means of dud minimisation during operations.

The bottom line is that one will be far less likely to have weapons that are producing an unacceptable dud rate, if one is operating weapons that have been designed and tested to ensure they cope with the environment in question.