Broken Arrows (no, they have nothing to do with The Hunger Games!).

Imagine, 30 years ago this month, the world as we know it might have become a wasteland -- if the US and the then USSR had gone to war using nuclear weapons (ST, Sept 28).

Were there other near-misses? A US B-52 bomber broke up in mid-air over North Carolina in January 1961. Its two nuclear bombs plunged into earth too. There have been other near misses involving the US' arsenal:

http://www.slate.com/blogs/future_tense/2013/09/20/goldsboro_nuclear_accident_declassified_document_u_s_nearly_nuked_north.html

http://tbo.com/list/news-opinion-editorials/a-nuclear-near-miss-20130928/

We do not know much about nuclear near-misses (ie military, as distinct from civilian) elsewhere. But one site has compiled a list of known "Broken Arrows", ie, nuclear weapon accidents:

http://www.atomicarchive.com/Almanac/Brokenarrows_static.shtml