The DoD lock program is sponsored by several government agencies. Federal specifications from the DoD lock program regulate the storage of sensitive materials and secure door access. Six combination locks have been approved under FF-L-2740 for the protection of classified materials. Of those six combination locks, four are dormakaba products: X-07 lock was approved in February 1992, the X-08 in March 1999, the X-09 in June 2002, and the X-10 in April 2013. For more information about the DoD lock program or federal specifications, please contact the DoD Lock Program or visit their website.