FILE – In this July 12, 2016, file photo, Dallas Police Chief David Brown, at podium, speaks as President Barack Obama, former president George W. Bush and Vice President Joe Biden and others stand and applaud during a memorial service for five police officers that were killed, at the Morton H. Meyerson Symphony Center in Dallas. Brown, who’s drawn criticism amid plummeting morale among officers and widespread praise for his response to the July sniper attack that killed five officers, has announced his retirement. Brown issued a statement Thursday, Sept. 1, 2016, saying he will retire Oct. 22 after 33 years with Dallas police. (AP Photo/Eric Gay, File)