Two Americans were killed last week while fighting with US-backed Kurdish YPG units near Raqqa, ISIS' de facto capital in Syria.
US Army vet and former Occupy Wall Street activist killed fighting ISIS with Kurdish YPG in Syria
A third man, a British volunteer, was also killed last week.
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His dad said he started talking about joining the Army after September 11.
"He was just one of those guys that seemed fearless all the time,"
"He was incredibly social," Tylka also said. "If you were in his circle of friends, it was close. He was always there. His sense of humor is probably what people know him for the most. He was always cutting up. He always had wisecracks and could turn anything into a joke."
Grodt was reportedly a former Occupy Wall Street activist, who became well known after helping a female activist who had been pepper-sprayed, The Guardian reported. They became friends after that and eventually had a child together.
About a dozen American volunteers have died fighting in Syria, including Warden and Grodt, according to The Post. It's not known how many more Americans volunteers are currently there.