No Easy Day: The Firsthand Account of the Mission that Killed Osama bin Laden (2012) is a military memoir by a former member of the United States Naval Special Warfare Development Group (DEVGRU) who participated in the mission that resulted in the death of Osama bin Laden. The book was written by Matt Bissonnette under the pen name Mark Owen. It details Owen's career with DEVGRU, including several combat missions in which he participated with the unit. At least half of the book focuses on Owen's participation in the mission that killed bin Laden. Owen and his publisher's decision to release the book without first submitting it for United States Department of Defense (DoD) review generated controversy. The DoD claims that the book contains classified information, which the book's publisher denies. In late August 2012, advance publicity increased the initial print run from 300,000 copies to 575,000. This ultimately led the publisher to release the book on September 4, a week earlier than the originally planned September 11 release date. It also made the New York Times bestseller list.Shortly after the book's announcement, Owen's identity was revealed as Matt Bissonnette and the DoD confirmed that he was in fact the author. For media appearances, including an interview on 60 Minutes, Owen appeared incognito. In August 2016, he was ordered to return his royalties of US$6.8 million to the US federal government.