The Syrian Electronic Army (SEA) has attacked the recruitment website of the US Marine Corps, urging troops to 'refuse orders' if the US attacks Syria.
The hackers posted messages on the website, which also included photos of people in military-style uniform holding hand-written signs notifying that they would not battle for Al-Qaeda in Syria.
Wall Street Journal cited a letter from hackers saying that the Syrian army should be "your ally not your enemy".
"Refuse your orders and concentrate on the real reason every soldier joins their military, to defend their homeland," the letter said.
"You're more than welcome to fight alongside our army rather than against it."
The latest attack comes after the US President Obama reportedly supported military action against the Syrian government in revenge over the use of chemical weapons 'against its own citizens'.
During early August, news websites including the Washington Post, CNN and Time were also attacked by the Syrian Electronic Army, which redirected users to their website.