Mark it down on the calendar: In March, 2014, the United States Military did not lose any personnel killed by enemy action in Iraq or Afghanistan for the first time in more than a decade.
It was February, 2003, just before the invasion of Iraq, that the U.S. last saw a month without casualties from hostile action in that country -- that's 133 months ago.
March 20, 2003 the U.S. invaded Iraq and quickly wrapped up a ground war which toppled the government of Saddam Hussein and resulted in the dictator's execution.
Of course, by the time of that invasion, the U.S. and coalition forces had already been in Afghanistan since October 7, 2001 after the Taliban government in that country refused to hand over Osama Bin Laden.
But a bloody and stubborn insurgency has killed thousands, including a lot of Americans.
According to iCasualties.org, the last time the U.S. had zero fatalities in the Operation Enduring Freedom theater (Afghanistan, Pakistan) due to enemy action was January, 2007.