Major League Baseball will honor the victims of the Sandy Hook Elementary School shooting during the opening games of the 2013 Regular Season. All players, managers, coaches, umpires and on-field personnel will wear a symbolic ribbon patch and, with fans, observe a pre-game moment of silence in their opening games (March 31st to April 2nd) in a league-wide effort to remember the 26 individuals who lost their lives on December 14, 2012 in Newtown, Connecticut.

Was this voluntary? I looked at Yu Darvish photos and there isnt a Sandy Hook patch on his jersey from his game on April 2.