Flag at Half-Staff Sunday, May 15

Peace Officers Memorial Day is Sunday, May 15. The day honors peace officers who have died, or who have been disabled, in the line of duty. The U.S. Flag Code is a codification of rules and customs pertaining to the display of the flag of the United States for use by civilians or civilian groups/organizations as may not be required to conform with regulations promulgated by executive departments of the government of the United States. 

In accordance with U.S.C. Title 4, Chapter 1, Section 7(m) of the U.S. Flag Code, the flag of the United States shall be flown at half-staff from dawn to dusk on Peace Officers Memorial Day.

White House proclamations are available here.