There are several books out on Bolo's. What is a Bolo? From a book called Old Soldiers written by David Weber. The Bolo concept was developed by another writer named Keith Laumer. This book is from Baen. There are several boos about Bolo's most are a compilation of short stories But Weber also wrote a complete book on the Bolo. It is well worth the read if you like Science Fiction and war stories.