Nicknames accompany a number of fighters within Islamic State ranks and it’s easy to see why they gave this man his. Picture: Channel 4/YouTube

Over his shoulder he carries a weapon so large it’s normally mounted to a vehicle before it can be fired.

On his face he wears a mask to conceal his identity — but he is unmistakable.

People know him as “The Bulldozer of Fallujah” and he’s the world’s most feared terror group’s biggest weapon.

Until this week, the unnamed member of Islamic State tried to blend into the background. His exploits are now front and centre after his treatment of a 14-year-old boy named Omar.

On Omar’s phone are pictures of The Bulldozer. There are also pictures of his own cut-off hand and foot.

In an interview with Channel 4, the teen, whose name has been changed, told a story that haunts him and has left him so devastated he has “given up on life”.

A picture of the man who took Omar’s foot and hand for refusing to join ISIS. Picture: YouTubeSource:YouTube

HOW I CAME FACE-TO-FACE WITH THE BULLDOZER

Omar was in Syria fighting with the Free Syrian Army when things went terribly wrong.

He was running ammunition and food to fighters made up of defected Syrian Armed Forces officers and everyday civilians.

Islamic State moved in on Deir Ezzor province, according to Channel 4, and Omar was captured. He was transferred to the Iraqi city of Mosul and offered a chance at freedom. The cost? Joining the death cult.

When Omar refused, they decided to teach him a lesson.

“I was strung up and tortured for a month and a half,” the teen said. “They were saying ‘Why don’t you pledge allegiance to Islamic State? Why don’t you fight against the non-Muslims with us?’ But they are slaughtering Muslims.”

He said IS made a show out of torturing him. The show would turn bloody and change his life forever when The Bulldozer moved in.

“They gathered the people, they tied down my hand and my leg, they put my hand on a wooden block and cut it off with a butcher’s knife,” Omar told Channel 4.

“Then they cut off my foot and put them both in front of me for me to see.”

Months later, hobbling around his home with bandages covering the ends of his limbs, Omar says he has lost all hope.

“I have given up on life.”

The Bulldozer is Islamic State’s enforcer.Source:YouTube

The Bulldozer is not the only one fighting in the Middle East with a terrifying nickname. Jihadi John, also known as “The Butcher”, rose to infamy for beheading US and English journalists and aid workers. Dressed in black behind prisoners in orange suits, the English-born Muslim originally named Mohammed Emwazi was ruthless in carrying out executions.

The good guys have their own big names, none bigger than the “Father of the Archangel of Death”.

The former Iraqi soldier’s real name is Abu Azrael. Dressed in black and armed with a machine gun, an axe and a sword, he presents an imposing figure. He even has his own Facebook page with more than 340,000 likes.

On the page, Azrael, also known as “Iraq’s Rambo”, is pictured smiling with other soldiers, lifting weights in a gym and shouldering a rocket launcher.

He is believed to have killed a number of Islamic State fighters in dozens of locations but also had experience fighting against US forces during the Iraq War.

It’s unlikely The Bulldozer and The Father of the Archangel of Death will ever meet, but it hasn’t stopped the internet from wishing they would.