"May God have mercy on your soul because we are coming and we will have none to give."

Last December, in what would end up being the final fight of his MMA career, Tim Kennedy was beaten to a pulp by fellow UFC middleweight Kelvin Gastelum. Not long after, as he announced his retirement, Kennedy declared that he "will always have the heart of a fighter."

A few short months later, he's proving those words to be true by re-enlisting with the U.S. Army Special Forces. Kennedy, who first enlisted in 2004, has seen time in Iraq and Afghanistan as a Green Beret sniper and most recently served as a sergeant first class with the Texas Army National Guard.

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As he told Fox & Friends on Sunday though, the recent dropping of a massive concussive bomb, dubbed the "mother of all bombs," on remote ISIS tunnels in rural Afghanistan has renewed his war fighting spirit.

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“The military, we’ve got our teeth back,” he said. "We have a reinvigorated, hopeful, beautiful military that is proud to be back on the team."

Kennedy went on to praise President Trump and his appointment of noted military leaders to positions of importance within the national security apparatus.

“I jumped out of a helicopter last weekend and raised my hand and said ‘I’ll protect the Constitution,’ ‘cause I got people who will back me now,” he said, referencing Trump's selection of Gen. James Mattis as Defense Secretary and Gen. H.R. McMaster as National Security Advisor.

Kennedy is eager to get into the battlefield, where he's got his eye on destroying ISIS. "They're a bunch of cowards," he told Fox.

The feeling, among members of the radical terrorist group, is mutual. Last January, ISIS-affiliated trolls threatened Kennedy's life and the threats were deemed credible enough that the FBI began investigating. At the time, Kennedy said, "Let those cowards come."

Now he's appeared to change his tune. Instead of waiting for ISIS to come to him, Kennedy is going to take the fight to them.