A New York City firefighter was among four Americans killed by a bomb in Afghanistan on Monday, according to the New York Post. Three U.S. service members and one contractor were killed in the car bombing outside Afghanistan’s Bagram Air Base on Monday. One has been named as Christopher Slutman, a married father of three and 15-year veteran of the FDNY who also served as a U.S. Marine. “He was really a great guy,” one source told the New York Post. “He loved being a fireman, and he was a real family man.” Slutman was reportedly awarded the Fire Chiefs Association Memorial Medal for a heroic act in 2014 when he rescued an unconscious woman from a blazing building in the Bronx. Monday’s killings bring the total number of Americans killed in Afghanistan this year to seven.