The US Department of Defense has made public the second phase of declassified documents related to unidentified flying objects, known as UFOs, on its official website. The released documents contain hundreds of new claims about green spheres and fireballs observed in the sky. Officials stated that these documents were shared for transparency purposes and do not require any security clearance for access. The documents also include videos recorded in military operation zones and related notes. This development is expected to increase public interest in UFO research while prompting further examination of the document details.