A former US soldier now battling Isis in Syria has warned others thinking of joining the fight not to expect it to be like a computer game.

Randy Roberts, known as Red, is currently based in a camp in northern Syria where he is fighting Isis alongside the Kurdish People’s Protection Units (YPG).

A former specialist with the 25th Infantry Division who did two tours of duty with the US army in Iraq, he told CNN: “You meet a lot of people who think this is going to be the gaming experience – [like] Call of Duty.

“They think because they understand how to pull the trigger on a console they know how to do it in real life.”

Mr Roberts was studying graphic design in the US when he became aware that he could "actually contribute and help the cause" in fighting Isis in war-torn Syria and Iraq.

He tried to join the US army again last year, but said the country's recent ban on soldiers having more than four tattoos meant he could not do so.

Instead, he made his own way to Iraq, using Google to plan his journey, and spent seven months there before travelling on to Syria.

Western fighters join Kurds in battle against Isis Show all 9 1 /9 Western fighters join Kurds in battle against Isis Western fighters join Kurds in battle against Isis Foreign Fighters A 67-year old foreign fighter from Canada, nick-named by Kurdish fighters as Hewal Zinar, poses for a photo on April 19, 2015 Uygar Onder Simsek / AFP Western fighters join Kurds in battle against Isis Foreign Fighters A 23-year old fighter and ex-US marine from the US, nick-named by Kurdish fighters as Hewal Agir, guards a look out point during clashes with Islamic State (IS) group fighters on April 17, 2015, in the outskirts of the north-western Syrian town of Tal Tamr AFP Western fighters join Kurds in battle against Isis Foreign Fighters A 26-year old from the US, nick-named by Kurdish fighters as Hewal Dilsad, shows a picture of his wife and son as he poses for a photo on April 14, 2015, in the outskirts of the north-western Syrian town of Tal Tamr Western fighters join Kurds in battle against Isis Foreign Fighters Ex-US marines aged 23 and 24 from the US, nick-named by Kurdish fighters as Hewal Agir (R) and Hewal Agit, guard a position during clashes with Islamic State (IS) group fighters on April 17, 2015, in the outskirts of the north-western Syrian town of Tal Tamr AFP Western fighters join Kurds in battle against Isis Foreign Fighters A group of international foreign fighters pose for a photo on April 16, 2015, in the outskirts of the north-western Syrian town of Tal Tamr AFP/ Getty Images Western fighters join Kurds in battle against Isis Foreign Fighters A foreign fighter poses for a photo with a machine gun on April 19, 2015, in the outskirts of Tal Tamr AFP Western fighters join Kurds in battle against Isis Foreign Fighters A 28-year old foreign fighter from the UK, nick-named by Kurdish fighters as Hewal Baran, poses for a photo on April 19, 2015, in the outskirts of the north-western Syrian town of Tal Tamr, north of Hasakeh AFP/ Getty Images Western fighters join Kurds in battle against Isis Foreign Fighters A 21-year old from the UK and 23 year-old from the US nick-named by Kurdish fighters as Hewal Sores (L) and Hewal Agir guard a post on April 19, 2015 AFP/ Getty Images Western fighters join Kurds in battle against Isis Foreign Fighters A 67-year old man from Canada and a 40-year old from the UK, nick-named by Kurdish fighters as Hewal Zinar (L) and Hewal Cudi train on April 19, 2015, in the outskirts of the Tal Tamr AFP

Motivated to act by the “mass slaughter of innocent people”, he is now helping to train Kurdish fighters and other volunteers - many of whom have very little experience.

But he told the news channel he believes westerners coming to the region looking for a ‘video game experience’ should not be there, however well-intentioned they may be.

“If you want to do fighting in other countries, do fighting for your own country first,” he added.

After a break at home, he is planning to return to Syria to continue the fight against terrorism.

He said: “It’s better to stand up and do something if you think you can help, than to just sit back and watch because ‘hey it’s on the other side of the world and not my problem’."

The experienced soldier said he knows he could die, but has no regrets.