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

2003

• Marines mistakenly shot and killed four Afghan soldiers outside the U.S. Embassy in Kabul, Afghanistan. The slain soldiers were part of a disarmament team unloading weapons at a collection depot in an intelligence agency complex across from the embassy. Conflicting reports claimed the Marines were returning fire after being fired upon. Embassy officials blamed “heightened tensions” for the incident. The Afghanistan government issued assurances that relations between the two countries would not be harmed by the tragic misunderstanding.

2008

• Raid Report – May 21, 2008

Casualties on May 21:

• CALDWELL, NATHANIEL ALEXANDER – May 21, 2003
• HORTON, JEREMY RICHARD – May 21, 2004
• ZABIEREK, ANDREW JONATHAN – May 21, 2004
• TUCKER, STEVEN CHARLES – May 21, 2005
• RAMIREZ, BENITO ANTONIO – May 21, 2006
• ARDRON, BRIAN DANIEL – May 21, 2007
• DAVIS, MICHAEL WARNER – May 21, 2007
• WEAVER, SHANNON VAUTIER – May 21, 2007
• BARNARD, LEEVI KHOLE – May 21, 2009
• BROOKS, PAUL FARIS – May 21, 2009
• GEORGE, JASON EVERETT – May 21, 2009
• GONZALEZ, AMILCAR H – May 21, 2010
• FIELDS, ARRONN DAVID – May 21, 2012
• BURRIS, RYAN DANIEL – May 21, 2015