National Yellow Bat Day is observed on April 21 to honor the activation of the 265th Army Security Agency Company (Airborne) with the support of the 101st Airborne Division in Kentucky. This day commemorates the contributions of the Army Security Agency, which was responsible for intelligence gathering, communication security, and electronic countermeasure operations. The 265th ASA, symbolized by a bat, reflects qualities of secrecy and mystery, aligning with its surveillance and intelligence support mission. The day was declared by Doug Bonnot, a member of the 265th Radio Research Company, in 2016. Celebrations typically include recognition of the unit's history and the importance of its contributions to military intelligence.