Peace Officers Memorial Day and Police Week is an observance that pays tribute to the local, state, and federal peace officers who have died, or who have been disabled, in the line of duty. The formal memorial is on May 15, and Police Week is the calendar week in which the memorial falls.
On Wednesday, May 15, Postal Service facilities are required to fly the U.S. flag at half-staff.
To fly the flag at half-staff, hoist the flag to the peak for an instant and then lower it to the half-staff position. The flag should be raised to the peak again before it’s lowered for the day.