The special forces of the Australian Defence Force are units of Special Operations Command and associated units of the Royal Australian Navy and the Royal Australian Air Force that conduct and or support special operations to advance and protect the national security of the Commonwealth of Australia. The special forces of Australia have a lineage to a variety of units raised in the Second World War such as the Independent and Commando Companies, Z Special Unit, Navy Beach Commandos, and the Coastwatchers. Australian special forces have most recently been deployed to Iraq in Operation Okra as the Special Operations Task Group, as the Special Operations Task Group in Afghanistan, in Afghanistan in support of the Australian Secret Intelligence Service and regularly for counter-terrorism pre-deploy to locations of major domestic events throughout Australia in readiness to support law enforcement such as the 2014 G20 Brisbane summit.