NATO has two immediate reaction forces: the Standing NATO Maritime Groups (SNMG) composed of SNMG1 and SNMG2, and the Standing NATO Mine Countermeasures Groups (SNMCMG) composed of SNMCMG1 and SNMCMG2.
The Standing NATO Maritime Groups are a multinational, integrated maritime force made up of vessels from various allied countries. These vessels, including their air assets, are permanently available to NATO to perform different tasks ranging from participating in exercises to intervening in operational missions. These groups provide NATO with a continuous maritime capability for operations and other activities in peacetime and in periods of crisis and conflict. They also help to establish Alliance presence, demonstrate solidarity, conduct routine diplomatic visits to different countries, support transformation and provide a variety of military maritime capabilities to ongoing missions.