This chapter explores military documents and notable historical memos concerning unidentified flying objects (UFOs), emphasizing their significance in ufology and national security. It contrasts historical UAP reports from the 1950s with modern evaluations, highlighting the military's focus on current threats while addressing international perspectives on UAP. The discussion also delves into the secrecy surrounding UAP, the implications of military footage, and the challenges of connecting past data with present-day security concerns.