Botched Weapons Testing

In North New Jersey there was recently an incident that could have been catastrophic for one family. A large shell fired from the base actually fell through a families house and injured their cat so much it had to be euthanized. Although, I have always supported our military when it comes to war and even weapons testing i feel that there should be a greater effort on their part to make sure accidents like this do not happen because if it possible for this to happen what ensures that a worse accident then this wont occur.