National Defense Transportation Day is a United States Federal Observance Day observed on the third Friday in May.National Defense Transportation Day, which occurs annually on the third Friday of May, remembers the contr .. know more
National Defense Transportation Day is a United States Federal Observance Day observed on the third Friday in May.National Defense Transportation Day, which occurs annually on the third Friday of May, remembers the contributions of people working in the United States' transport industry. It is part of National Transportation Week.