One of the better books about UFO sightings that contains much evidence including documentation and radar confirmations. The military personnel along with civilians who worked at the nuclear sites had to go through much to get their clearances. These people are not ones to make this stuff up.
I do think this book would be interesting for a club meeting when discussing evidence to support the Extraterrestrial Hypothesis Theory. Many Close Encounters of the First Kinds with a few others that shut down missiles.
Robert Hastings has done his homework and vets his witnesses thoroughly. There are much more incidents in the book other than the famed Echo and Oscar Flight Incidents (which are also included).
A must read for the avid ufologist and those interested in the topic.