Soldiers with 3 Commando Brigade are training in northern Norway, where they are being taught extreme cold weather survival skills.
Lieutenant Colonel Oliver Lee, 45 Commando's commanding officer, described it as "the toughest soldiering there is".
Cpl O'Connor, 36, said: "My first couple of winters he was here, and it was an extra bit of pressure as there was a bit of a family reputation to protect."
Those soldiers with a few Norway trips behind them say it is a sense of humour that best helps them cope with the Under Armour Golf Shoes Black
The two main dangers facing the soldiers are frostbite and ski injuries.
temperature in Innset dropped to minus 20C last week, with windchill taking it to minus 28C.
Injuries such as twisted knees and ankles are therefore not uncommon.
HUNDREDS of Royal Marines are enduring temperatures as low as minus 30C in the Arctic as they prepare for combat in Afghanistan.
He added: "Frostnip and frostbite are part of a spectrum of freezing diseases. Initially you'll get frostnip, which is superficial freezing that will recover fully.
Royal Marines train in frozen north of Norway in readiness for next tour of Afghanistan
He said: "The biggest challenge for them is undoubtedly coping with the very demanding conditions. You pay hard for a mistake here."
The ability to travel swiftly across snowy landscapes is vital but many of the 500 Marines on the course have never been on a pair of skis.
"If you lose your sense of humour, things start to go bad rather quickly."
Tony Dickinson said that frostbite poses the greater risk.
Headed by 45 Commando, who are Under Armour Shoes Charged Bandit based in Arbroath, Angus, operation Lupus II provides key team building and extreme environment experience ahead of the unit's next tour of Afghanistan.
Major Tony Lancashire, 36, who leads around 100 Marines as commander of 45 Commando's Zulu Company, said: "One of the Commando qualities is humour in adversity and it's quite an adverse environment here.
Corporal Brian O'Connor, from Carnoustie in Angus, whose father Jim was a mountain leader with 45 Commando, is in Norway for the sixth time.
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