PHOTOS: Fallen officers remembered at Dallas memorial

Officials stand for the National anthem during a memorial service at the Morton H. Meyerson Symphony Center (AP Photo/Eric Gay)

From left, Vice President Joe Biden, Laura Bush, former President George W. Bush, and first lady Michelle Obama (AP Photo/Eric Gay)

From left, former president George W. Bush, first lady Michelle Obama and President Barack Obama (AP Photo/Eric Gay)

President Barack Obama stands with, from left, Jill Biden, Vice President Joe Biden, Laura Bush, former president George W. Bush and first lady Michelle Obama (AP Photo/Eric Gay)

Portraits of the five fallen police officers are seen at rear as a memorial gets underway (AP Photo/Eric Gay)

Portraits of five fallen officers are arranged prior to a memorial service at the Morton H. Meyerson Symphony Center (AP Photo/Eric Gay)

Members of law enforcement wait to enter the Morton H. Meyerson Symphony Center for a memorial for fallen police officers (AP Photo/Eric Gay)

President Barack Obama and first lady Michelle Obama walk across the South Lawn of the White House in Washington (AP Photo/Pablo Martinez Monsivais)

President Barack Obama and first lady Michelle Obama walk across the South Lawn of the White House in Washington (AP Photo/Pablo Martinez Monsivais)

President Barack Obama heads to Air Force One at Andrews Air Force Base in Md. (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama walk out of the White House in Washington (AP Photo/Pablo Martinez Monsivais)

President Barack Obama and first lady Michelle Obama prepare to walk up the steps of Air Force One at Andrews Air Force Base in Md. (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama walk up the steps of Air Force One at Andrews Air Force Base (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama walk across the South Lawn of the White House in Washington (AP Photo/Pablo Martinez Monsivais)

President Barack Obama and first lady Michelle Obama board Air Force One at Andrews Air Force Base (AP Photo/Evan Vucci)

President Barack Obama boards Air Force One at Andrews Air Force Base (AP Photo/Evan Vucci)

Members of law enforcement wait to enter the Morton H. Meyerson Symphony Center for a memorial for fallen police officers (AP Photo/Eric Gay)

DART police officer Misty McBride, right, is embrace by a fellow officer as she arrive for a memorial (AP Photo/Eric Gay)

Members of law enforcement wait to enter the Morton H. Meyerson Symphony Center (AP Photo/Eric Gay)

Seats hold flags and hats for fallen officers during a memorial service at the Morton H. Meyerson Symphony Center (AP Photo/Eric Gay)

President Barack Obama and first lady Michelle Obama in Dallas. (AP Photo/Susan Walsh)

President Barack Obama, accompanied by Sen. Ted Cruz, R-Texas (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama arrive via Air Force One at Dallas Love Field in Dallas (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama in Dallas. (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama arrive on Air Force One at Dallas Love Field (AP Photo/Tony Gutierrez)

A policeman visits a makeshift memorial at the Dallas police headquarters (AP Photo/Eric Gay)

President Barack Obama and first lady Michelle Obama (AP Photo/Pablo Martinez Monsivais)

In this Friday, July 8, 2016 file photo, Cynthia Ware places flowers on a make-shift memorial at the Dallas police headquarters (AP Photo/Eric Gay)

Portraits of five fallen officers are arranged prior to a memorial service at the Morton H. Meyerson Symphony Center (AP Photo/Eric Gay)