License types

Detailed description of the licenses used throughout this website

Public domain
The images have been released to public domain by their authors, they have expired copyrights or they are ineligible for copyright protection.

Public domain - DoD
This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.