Pro-Syrian government hackers defaced a Marine Corps recruitment website Monday, posting a letter on Marines.com arguing that the Syrian government is “fighting a vile common enemy.”

Capt. Eric Flanagan, a spokesman for the Marine Corps, confirmed to the Wall Street Journal that the Marines site had been hacked. The Syrian Electronic Army claimed responsibility.

“The Syrian army should be your ally not your enemy,” the letter read. “Refuse your orders and concentrate on the real reason every soldier joins their military, to defend their homeland. You’re more than welcome to fight alongside our army rather than against it.”