U.S. soldiers rest along a ridgeline on March 31, 2014 near Pul e Alam, Afghanistan.

Story highlights

Last month is one of three months since 2002 that no U.S. military have died in Afghanistan

The previous months were July 2002 and January 2007

A NATO service member died Tuesday in southern Afghanistan

In all, 2,309 U.S. military members have died in Afghanistan since October 7, 2001

CNN  — 

No U.S. military forces died last month in Afghanistan, marking the first such month in more than seven years and the third time since the war began more than 12 years ago, according to the CNN Library, which tallies the casualties.

Here are some other numbers:

• The previous months in which no U.S. deaths occurred during Operation Enduring Freedom were January 2007 and July 2002, CNN Librarian Lindsey Knight said.

• Separately, NATO said one of its service members died Tuesday of a non-battle-related injury in southern Afghanistan.

• Fourteen U.S. combat deaths have occurred this year in Afghanistan, seven each in January and February.

• In all, 2,309 U.S. military members have died in Afghanistan since hostilities began there on October 7, 2001. Three additional Department of Defense civilians have died.

According to NATO’s website, its primary goal is to help Afghan authorities provide effective security across the country and ensure that terrorists cannot again use the country as a haven.

Its mission is slated to end at the end of the year.

READ: U.S. planning possible withdrawal of all troops from Afghanistan

READ: Taliban attack Afghan election commission compound ahead of vote

INTERACTIVE: Explore the number of U.S. and coalition troops who have died in Iraq and Afghanistan