Lieutenant Colonel William Steele, a former US commander at the jail that held Saddam Hussein, was jailed on Friday for two years after a court martial found him guilty of illegally possessing classified documents.
Lieutenant Colonel Steele was also dismissed from military service, and will forfeit all pay and allowances. However, his sentence will be cut by 229 days as he has already served that in detention in Kuwait awaiting trial.
Steele was acquitted on the more serious charge of aiding the enemy by supplying an unmonitored mobile phone to an inmate.
The judge, Lieutenant Colonel Timothy Grammel, also found him guilty of having an inappropriate relationship with an Iraqi interpreter and failing to obey an order.