In late 2003, 3 RAR was warned to provide a Company Headquarters and a four rifle section platoon for security duties in Iraq on Operation Catalyst. A Company was subsequently deployed to Baghdad from December 2003 to May 2004. It provided specific local protection to the Australian Diplomatic Mission in Baghdad as part of the Security Detachment (SECDET). On 13 April 2004 SECDET elements were involved a very successful contact when an ASLAV engaged a mortar base plate that was firing on the Green Zone. From February 2006 until March 2007 the battalion returned companies to Baghdad as SECDET IX and SECDET X. Both tours were eventful with several contacts, a rocket attack that injured four soldiers, and the accidental death of Private Jacob Kovco in April 2006—Australia's first casualty in Iraq and the subject of intense media attention. The battalion has been awarded the Theatre Honour Iraq 2003-11.