National Defense Transportation Day is a United States Federal Observance Day observed on the third Friday in May. According to 36 U.S.C. § 120, on National Defense Transportation Day, the president urges "the people of the United States, including labor, management, users, and investors, in all communities served by the various forms of transportation to observe National Defense Transportation Day by appropriate ceremonies that will give complete recognition to the importance to each community and its people of the transportation system of the United States and the maintenance of the facilities of the system in the most modern state of adequacy to serve the needs of the United States in times of peace and in national defense."