On May 30, 2013, the first book on the history of the air marshals was published in the United States by Federal Air Marshal Clay Biles, who resigned three days after its publication. The book, titled "The United States Federal Air Marshal Service: A Historical Perspective, 1962–2012," gave never-before-released information on the more than fifty years of Federal Air Marshal Service. On July 1, 2014, a new book and personal memoir was published by Biles. The book, titled "Unsecure Skies," gave a behind the scenes look at the inner workings of the Federal Air Marshal Service under the Transportation Security Administration, including discussions on alleged bureaucratic strain and favoritism within the agency.