Honoring Nancy Reagan, former First Lady of the United States
UPDATE: We now know that Nancy Reagan's funeral will take place on Friday, March 11, 2016. As such, flags may be returned to full-staff at sunset the same day.
On March 7, 2016, The President of the United States issued a proclamation ordering the flag of the United States to be displayed at half-staff from then until sunset on the day of Nancy Reagan's funeral, which had not yet been scheduled.
Presidential Proclamation: Death of Nancy Reagan
As a mark of respect for the memory of Nancy Reagan, I hereby order, by the authority vested in me by the Constitution and the laws of the United States of America, that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, on the day of interment. I also direct that the flag shall be flown at half-staff for the same period at all United States embassies, legations, consular offices, and other facilities abroad, including all military facilities and naval vessels and stations.
IN WITNESS WHEREOF, I have hereunto set my hand this seventh day of March, in the year of our Lord two thousand sixteen, and of the Independence of the United States of America the two hundred and fortieth.
For information on flying your flag at half staff, read here.