Bill Belichick's biggest influence in his life was his father, Steve, who passed away in 2005. Steve Belichick played in the NFL and went on to coach at Navy for 50 years during the team's heyday.
But before all that, Steve served in the Navy during World War II, spending time in both Europe and the Pacific during the war.
Because of that connection, and his father's enormous influence in his life, Bill Belichick decided to lend his voice to a World War II documentary entitled D-Day: Over Normandy.
Check out the trailer for the film, featuring coach Belichick's voice, in the clip.