Sea Frontiers were several, now disestablished, commands of the United States Navy as areas of defense against enemy vessels, especially submarines, along the U.S. coasts.
The land areas of the Frontiers corresponded roughly to the Army's Defense Commands, but the boundaries were not identical.
Toward the end of the war the Frontiers were assigned administrative and logistic functions in addition to their operational responsibilities.
First established on 15 April 1944 with Vice Admiral Frank J. Fletcher in command, who remained in that capacity for the duration of the War as Task Force 91.
[5] It was responsible for protecting the waters of Florida and the Bahamas as well as the Gulf of Mexico, the Yucatán Channel and areas near Cuba.
The Assistant Chief of Staff (HawSeaFron) attempted to mold the organization to a degree similar to the Western Sea Frontier.
Since the Crater was on U.S. Army property, the construction of a Joint Operating Center with a major plot was never accomplished because of the fluctuations of the war and difficulties over appropriations.
On 15 April 1944, the Seventeenth Naval District, which consisted of Alaska and the Aleutian Islands, was established, and the Northwest Sea Frontier was abolished.
Following admirals held command of the frontier during the World War II: Panama Sea Frontier was responsible for the defense of the Pacific and Atlantic sea approaches to the Panama Canal and for naval shore facilities in the Central America region during World War II.
The Western Sea Frontier was composed of many forces and commands, including the Eleventh, Twelfth, and Thirteenth Naval Districts.
The Western Sea Frontier consisted of the Pacific Coastal regions lying west of the Cascade Range and Sierra Nevada as well as of Alaska.