In October 1948-one year after the creation of the U.S. Air Force as a separate military branch-a B-29 Superfortress crashed on a test run, killing the plane's crew. The plane was constructed with poor materials, and the families of the dead sued the U.S. government for damages. In the case, the government claimed that releasing information relating to the crash would reveal important state secrets, and refused to hand over the requested documents...