One of three American service members killed in a roadside car bomb attack on a convoy outside of Afghanistan's Bagram Airfield on Monday was a New York City firefighter, officials said Tuesday.

Marine Corps Staff Sgt. Christopher Slutman, a 15-year veteran of the New York City Fire Department, worked for Ladder Companies 27 and 17 in the Bronx, according to the Uniformed Firefighters Association.

He was also a 19-year volunteer with the Kentland Fire Department serving Landover and Prince George’s County, Maryland, according to Chief Oleg Pelekhaty.

FDNY Firefighter and U.S. Marine Christopher Slutman was killed in an attack in Afghanistan on April 8, 2019. FDNY

Slutman was on active duty in Afghanistan on Monday when the roadside bomb went off, killing two other U.S. service members and wounding another three. The Taliban claimed responsibility for the attack.

One of the other Marines killed was identified as Benjamin Hines, his father confirmed to NBC News on Tuesday.

The 31-year-old sergeant was from York, Pennsylvania, according to information provided by the Department of Defense on Tuesday night.

Cpl. Robert Hendriks, 25 of Locust Valley, New York. Courtesy Hendriks Family

Cpl. Robert A. Hendriks, 25, of Locust Valley, New York, was also killed, federal officials said. The three Marines were supporting Operation Resolute Support.

Hendriks' mother, Felicia, told NBC News that her son always wanted to be a Marine and enlisted directly after his 2012 high school graduation.

She said has another son who is also a Marine.

“I just want his name out there and where he was from. He loved what he did. And we are so proud of him and his brother," Felicia Hendricks said. "And he always was willing to die for his country. He was actually set to come home in about a month and that’s just the tragic part is that he was supposed to come home. He loved the service, he loved his country, and he was loved by everyone who knew him.”

New York City Mayor Bill de Blasio ordered flags to be lowered to half-staff Tuesday for Slutman. The mayor said in a statement that he had presented Slutman with the Fire Chief’s Association Memorial Medal in 2014 after the firefighter had saved an unconscious woman from a burning South Bronx apartment.

"This unquestionably is an example of the measure of this man. Christopher Slutman is an American hero, a New York hero, and we mourn his loss today," De Blasio said.

“Firefighter Slutman bravely wore two uniforms and committed his life to public service both as a New York City Firefighter and as a member of the United States Marine Corps,” FDNY Commissioner Daniel A. Nigro said. “The hearts and prayers of the entire Department are with his loved ones and with the families of his fellow service members who lost their lives in service to our nation.”

Christopher Slutman was an American hero. I had the honor of meeting him in 2014 after he made a life-saving rescue in the South Bronx. His courage and commitment to his city and country will never be forgotten. Please keep his wife, children and the FDNY in your hearts today. pic.twitter.com/bRRGYujZCj — Mayor Bill de Blasio (@NYCMayor) April 9, 2019

Slutman was married with three daughters.

A ceremony honoring him was planned for Tuesday night at the Engine 46, Ladder 27 fire station.

He is the fourth FDNY member to die while serving in Iraq and Afghanistan since 2003, according to the department. Seventy-three FDNY personnel are currently serving on extended military orders and another 1,425 are military reservists or veterans.

U.S. officials originally said that a contractor had also been killed in the attack, but they found out the contractor, an Afghan citizen, was alive and had been treated for his injuries with civilians, the NATO-led Resolute Support mission said in a statement Tuesday.