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

2003

• End of Operation Ivy Serpent in Iraq

2008

• Raid Report – July 21, 2008

Casualties on July 21:

• BIBBY, MARK ANTHONY – July 21, 2003
• BLODGETT, NICHOLAS HENRY – July 21, 2004
• ENGEL, MARK EUGENE – July 21, 2004
• GILL, STEVEN PATRICK – July 21, 2005
• YOUNGBLOOD, TRAVIS LEVY – July 21, 2005
• RAFFERTY, CHRISTOPHER CONRAD – July 21, 2006
• PATE, CHRISTOPHER TODD – July 21, 2006
• WALLACE, MATTHEW PHILLIP – July 21, 2006
• SCHERER, CHRISTOPHER GEORGE – July 21, 2007
• SCHMUECKER, JACOB STEVEN – July 21, 2007
• WILSON, IVAN IRL – July 21, 2008
• MORALES, RAYMUNDO PORRAS – July 21, 2009
• RUNYAN, MICHAEL LOUIS – July 21, 2010
• STEVENSON, BENJAMIN ALLEN – July 21, 2011
• BRODSKY, MICHAEL JOHN – July 21, 2012
• PEPPER, BRANDON ROBERT – July 21, 2012
• MOUNT, BRYAN COOPER – July 21, 2020