FILE - In this Dec. 16, 2018, file photo, an official's flag sits on the field in the second half of an NFL football game between the Baltimore Ravens and the Tampa Bay Buccaneers, in Baltimore. Complaining about officials is a time-honored tradition that goes back to the days coaches _ and fans _ saw things only as they actually happened, without the benefit of super slow motion replays that at times get more study than the Zapruder tapes of the Kennedy assassination. (AP Photo/Carolyn Kaster, File)

FILE - In this Sunday, Dec. 16, 2018 file photo, Tampa Bay Buccaneers head coach Dirk Koetter walks off the field after an NFL football game against the Baltimore Ravens in Baltimore. The Atlanta Falcons are bringing back two familiar names by hiring Dirk Koetter as offensive coordinator and Mike Mularkey to coach tight ends. Koetter and Mularkey are joining coach Dan Quinn’s staff following stints as NFL head coaches. (AP Photo/Carolyn Kaster, File)