Alliance officials said the two wounded service members were in stable condition and receiving medical treatment.
Details of the incident, which is still under investigation, were not released.
The apparent insider attack occurred in a local airport in Tirin Kowt city, capital of southern Afghanistan's Uruzgan province.
Russian Federation v Croatia 07 July 2018
And it was Lovren's team that prevailed 4-3 in the shootout when Barcelona star Ivan Rakitic netted the decisive kick. After making the semi-final in 1998 in France the Croatians return to the last four, this time to face England .
It was not immediately clear who carried out the attack, or whether they had been apprehended. But as NPR's David Welna reported last week, a "public information blackout" by the Trump administration has meant that, "since late a year ago, the Pentagon's stopped posting those numbers for Iraq, Syria and Afghanistan".
The US still has an estimated 14,000 troops in the country helping support the Afghan military, despite NATO's combat mission in Afghanistan officially ended in 2014.
The Taliban released a statement on Twitter saying an Afghan soldier fired on US troops in the province of Uruzgan, AFP reported. Western officials say most insider attacks stem from personal grudges and cultural misunderstandings rather than insurgent plots.
Since U.S. involvement in Afghanistan began in October 2001, 1,876 U.S. military personnel have been killed in action and 20,385 have been wounded in action, as of May 31.
Tyler Honeycutt: Ex-NBA player dies after police shootout
A SWAT team entered the home and located an unresponsive male, who was pronounced dead at the scene, the LAPD tweeted at 3:45 a.m. Police haven't officially released his name, but LAPD identified the suspect as Honeycutt on police scanners.
The Pentagon said Maciel was part of Operation Freedom's Sentinel, which conducts counterterrorism missions targeting terrorist groups like al Qaeda and the local ISIS affiliate in Afghanistan and also focuses on building up local Afghan forces.
To date this year, three other troops have been killed in hostile incidents in Afghanistan.
The last "green-on-blue" attack occurred in August 2017 when a Romanian NATO soldier was killed.
The last insider attack that resulted in a USA casualty occurred in June previous year.
Chris Sutton's verdict on France vs Uruguay and Brazil vs Belgium
Most of our pundits have gone for a France win; only Gab Marcotti bucks the trend by saying Uruguay will make the semifinals. Like the World Cup opening match, the final will be played at the 81,000-seater Luzhniki Stadium in Moscow, Russia .