Reservist Day is observed in Ukraine every May 18, established in April 2019 by President Petro Poroshenko to honor the country's military reserve force. This official holiday recognizes the important role of reservists in protecting Ukraine's independence and territorial integrity. Reservists are citizens who combine civilian careers with military roles and are essential for providing additional manpower during crises, such as invasions or total war. The Ukrainian military reserve force, which has grown in significance since the War in Donbass, includes approximately 200,000 personnel, with over 170,000 being experienced and combat-ready. The day aims to promote modern military traditions and foster a patriotic spirit within the country.