Honors federal, state, and local officers killed or disabled in the line of duty.

National Defense Transportation Day, observed annually on the third Friday of May, honors the contributions of individuals working in the U.S. transportation industry. It is part of National Transportation Week....

Public Lands Day is a state observance in Colorado, celebrated on the third Saturday of May. It recognizes the importance of public lands in the state. (https://www.timeanddate.com/holidays/us/public-lands-day)

Armed Forces Day is observed annually on the third Saturday of May to honor men and women who serve in the U.S. military. (https://www.timeanddate.com/holidays/us/armed-forces-day)

The Preakness Stakes is an annual Thoroughbred horse race held at Pimlico Race Course in Baltimore, Maryland. It is the second event in the Triple Crown series. (https://www.timeanddate.com/holidays/us/preakness-stakes)

Emergency Medical Services for Children Day raises awareness about the need for specialized emergency care for children. (https://www.timeanddate.com/holidays/us/medical-service-children-day)

Harvey Milk Day is observed in California on May 22 to celebrate the achievements of Harvey Milk, a gay rights activist. (https://www.timeanddate.com/holidays/us/harvey-milk-day)

National Maritime Day recognizes the maritime industry and the benefits it brings to the country. It honors ships and seafarers significant to the nation's history. (https://www.timeanddate.com/holidays/us/national-maritime-day)