Integrated Publishing (by alaric)
Integrated Publishing, as far as I can tell, are an outfit who get the US military to release their training manuals under Freedom of Information Act requests, then (due to US laws that government works are in the public domain) sell them as books.
They have a load of cool information about all sorts of topics, from the nuclear interlock system in the missile handling systems of a naval ship to electronics, maths, and the disturbing M18A1 claymore mine.
It's worth a browse.