The Washington Nationals honored those affected by Monday's mass shooting at the D.C. Naval Yard by wearing Naval Academy hats before their doubleheader Tuesday against the Atlanta Braves.

GALLERY: MLB mourns Navy Yard victims

JESSE SPECTOR: Postponing the game on Monday was the right call

The blue-and-gold hats were delivered directly to the team by Navy Adm. Sandy Winnefeld, vice chairman of the Joint Chiefs of Staff.

Major League Baseball allowed the Nationals to wear the hats during batting practice and in a pregame moment of silence (see above), but they did not wear them in the game.

(Photo credits: The Associated Press)

PHOTO GALLERY: MLB honors Navy Yard victims