Supreme Headquarters Allied Powers Europe Command Operations has at its disposal standing forces such as: Airlift support for SACEUR's travels is provided by the USAF's 309th Airlift Squadron at Chièvres Air Base, Belgium. In 2012 and 2013, NATO underwent a reorganization of the military command, and the land component commands at Heidelberg and Madrid were deactivated, the maritime component command at Naples was closed and the air component command at Izmir also shut down. Today Allied Command Operations (ACO) is one of the two strategic commands of NATO (the other being Allied Command Transformation (ACT). Under this structure, there are two joint force operational headquarters
Supreme Allied Commander Atlantic the principal adviser to the SACLANT on submarine matters and undersea warfare. COMSUBACLANT was an American three-star admiral based in Norfolk, Virginia, who also served as the Commander Submarine Force Atlantic Fleet (COMSUBLANT). Under SUBACLANT were Commander, Submarines, Western Atlantic Area (COMSUBWESTLANT) and Commander, Submarines, Eastern Atlantic Area (COMSUBEASTLANT). COMSUBEASTLANT's national appointment was the Royal Navy post of Flag Officer Submarines. Flag Officer Submarines moved in 1978 from HMS Dolphin at Gosport to the Northwood Headquarters in northwest London. His Second-in-Command was the Deputy Supreme Allied Commander Atlantic: Supreme Allied Commander Atlantic The Supreme Allied Commander Atlantic (SACLANT) was one