The following are events related to the Global War On Terrorism (GWOT) that took place on this day.

2004

• Fallujah Blackwater Incident.  In Fallujah, four U.S. contractors (Blackwater) are killed, burned, and hung from a bridge.

2005

• Start of Operation San Juan in Iraq

Casualties on May 31:

• ODUMS, CHARLES EDWARD II – May 31, 2004
• SCHEETZ, ROBERT CHARLES JR – May 31, 2004
• SIDES, DUSTIN LEE – May 31, 2004
• RAMOS VARGAS, MIGUEL ANGEL – May 31, 2005
• BUCKLIN, BROCK LYLE – May 31, 2006
• KOLASA, ALEXANDER JAMES – May 31, 2006
• MEJIA, BENJAMIN ENRIQUE – May 31, 2006
• BAYLIS, MATTHEW EDWARD – May 31, 2007
• BEAN, MATTHEW ALAN – May 31, 2007
• DOMINO, CHADRICK OMAR – May 31, 2007
• FINLEY, JAMES MATTHEW – May 31, 2008
• SHIELDS, ANDREW JON – May 31, 2008
• REZA, MATTHEW GREGORY – May 31, 2009
• SAMSON, MARKO MATO – May 31, 2009
• STONE, SAMUEL DONALD – May 31, 2009
• EMMONS, RICHARD CHARLTON III – May 31, 2011
• POVILAITIS, ALEXANDER GEORGE JR – May 31, 2012