The Ministry of Defence has confirmed that the royal arrived at the main British base Camp Bastion in Helmand last night (September 6) as part of the 100-strong 662 Squadron, 3 Regiment, Army Air Corps.
"He will be in a difficult and demanding job," said Commander of the Joint Aviation Group Royal Navy Captain Jock Gordon.
"I ask that he be left to get on with his duties and allowed to focus on delivering support to the coalition troops on the ground."
Known as Captain Wales in his military role, Harry will take part in combat missions against the Taliban during his four-month deployment in the country.
The prince, who is an Apache helicopter pilot, had previously spent 10 weeks in Helmand in 2007-2008 on a secret deployment, but he was pulled out early after it was reported in the media.
Harry hit the headlines last month when naked photographs of the royal partying in a Las Vegas hotel room were published online and by The Sun newspaper.
Prince Harry in Afghanistan: photo gallery
Copyright: Rex Features