The Allied Atlantic Convoy Conference of early 1943 agreed to set up ten groups of anti-submarine warships with an escort carrier in each.[4] Many more support groups were created as production of anti-submarine warships and escort carriers exceeded the number required for screening convoys.[5] These groups were able to shift Allied focus from defensive support of convoy screens to offensive operations hunting and destroying enemy submarines.As Cold War tensions increased, the United States Navy formed modernized hunter-killer groups in anticipation of potential use of Soviet submarines to intercept North American shipping to European NATO allies.Newly operational SOSUS and shore-based Lockheed P-3 Orion maritime patrol aircraft assumed the mid-ocean ASW search and attack role of the disappearing CVS hunter-killer groups.