U.S. Navy type commands perform administrative, personnel, and operational training functions in the United States Navy for a "type" of weapon system (e.g., naval aviation, submarine warfare, surface warships) within a fleet organization.
All other surface warships (i.e., cruisers, destroyers, frigates, littoral combat ships, patrol vessels, and amphibious warfare vessels) fall under the administrative control of the appropriate Commander Naval Surface Force.
Normally, the type command controls the ship during its primary and intermediate training cycles, and then the warship moves under the operational control of the respective fleet command once it is ready for deployment.
Effective 1 October 2001, the U.S. Navy developed a "Lead-Follow" arrangement among its type commands wherein one type commander is designated the senior lead for the specific "type" of weapon system (i.e., naval aviation, submarine warfare, surface warships) throughout the entire operating U.S. Fleet as it pertains to modernization needs, training initiatives, and operational concept development.
Naval Air Forces, Atlantic Fleet (COMNAVAIRLANT) as his deputy.