With thanks to team photographers and Getty Images, here are photos of NFL officials in action in Week 4. Click on a photo to begin the gallery.
Tony Michalek and Brad Rogers (Los Angeles Rams)
Byron Boston (Kansas City Chiefs)
Walt Anderson (Kansas City Chiefs)
Greg Bradley (Baltimore Ravens)
Jim Mello (Minnesota Vikings)
Clay Martin and his crew (Green Bay Packers)
A partially obscured Jerod Phillips and referee Clay Martin (Green Bay Packers)
Back judge Greg Steed (Los Angeles Rams)
Mike Weatherford (Oakland Raiders)
Walt Coleman IV (Oakland Raiders)
Derek Bowers (Oakland Raiders)
Referee Clay Martin (Green Bay Packers)
Derek Bowers and Scott Novak (Oakland Raiders)
Fred Bryan (Green Bay Packers)
Craig Wrolstad (New England Patriots)
Umpire Bryan Neale (Seattle Seahawks)
Aaron Santi (Los Angeles Rams)
Referee Brad Rogers (Los Angeles Rams)
Referee Brad Allen (Minnesota Vikings)
Nate Jones (Green Bay Packers)
Tony Michalek (Los Angeles Rams)
Clay Martin tosses the coin (Green Bay Packers)
Steve Zimmer (Minnesota Vikings)
Brad Rogers (Los Angeles Rams)
Mark Pellis (Dallas Cowboys)
From Getty Images: