The U.S. Navy consists of two separate services, the Navy and the Marine Corps. The navy can be divided into four arms: naval forces, fleet aviation units, maritime service units, and shore-based units.

At present, the Navy has two oceanic fleets, namely the Atlantic Fleet and the Pacific Fleet, 11 aircraft carrier battle groups, and 10 carrier-based air wings, which are mainly equipped with 84 submarines, 143 large surface combat ships (including 11 aircraft carriers, 31 missile cruisers, 52 missile destroyers, and 49 missile frigates), 2,900 aircraft (1,728 combat aircraft), and 1,500 helicopters (including 487 armed helicopters).

1. Naval forces

The Navy's naval forces include surface ships and submarines, all of which are integrated into the two major strategic blocs in the Atlantic and Pacific Oceans. In peacetime, it is under the leadership of the Naval Operations Department, and in wartime, it is under the unified command of the headquarters of the respective theater. Both groups are organized in both administrative and task formats.

Administrative grouping: It is divided into the Surface Ship Command and the Underwater Ship Command. The surface ship command has a number of squadrons under its jurisdiction, including a surface ship group, a cruiser destroyer group, an amphibious ship group, a special operations group, a minesweeper group, and a supply ship group; a group has several squadrons under its jurisdiction, such as a cruiser destroyer group consisting of 2~4 cruisers and 2~4 destroyer squadrons. The establishment of the submarine force is roughly the same, except that the conventional submarine squadron is assigned 4~6 submarines, while the nuclear submarine squadron may be assigned 7~10 submarines. Aircraft carriers are usually organized into carrier battle groups, which are subordinate to the Fleet Aviation Command.

The so-called task group, that is, the special task group, is a mixed fleet formed for carrying out operations, exercises, tactical training, and a specific mission. It is only responsible for exercising campaign and tactical command over the units under its control, and is not responsible for their administrative affairs; the required troops are transferred from various administrative groups and returned to the administrative structure as soon as the tasks are completed. According to the size of the troops, the task group is divided into five levels: combat fleet, special task force, special task force, special task force, and special task force.

The combat fleet is the strategic corps of the Navy, which can independently carry out various large-scale battles. The U.S. Navy has five major combat fleets. The Pacific Fleet has three operational fleets, the 3rd (responsible for the Pacific Theater), the 7th (responsible for the Western Pacific Theater), and the 5th (responsible for the Indian Ocean, the Persian Gulf, and the Red Sea Theater), and the Atlantic Fleet has two operational fleets, the 2nd (responsible for the Atlantic Theater) and the 6th (responsible for the Mediterranean Theater). The strength of the fleets is much the same. For example, the Sixth Fleet has 1 aircraft carrier, 2 cruisers, 3 destroyers, 2 frigates, 2 attack submarines, 2 coastal patrol boats, 3 amphibious ships and 3 paving ships, a total of 18 ships. The 7th Fleet has 19 ships, and the 5th Fleet has 18 ships. In addition, the fleets also have some logistical support ships of the Military Shipping Bureau accompanying the combat vessels.

Aircraft carriers are the most important type of ship in the US Navy and are often the core force of the Navy in independently carrying out combat missions. At present, there are 11 aircraft carriers, including 8 nuclear-powered multi-purpose aircraft carriers, namely, 7 of the "Nimitz" class ("Nimitz", "Eisenhower", "Carl Vinson", "Roosevelt", "Lincoln", "Washington" and "Steanis"), 1 "Enterprise"-class nuclear-powered aircraft carrier ("Enterprise"), and 3 conventionally powered multi-purpose aircraft carriers, namely 2 "Kitty Hawk" class ("Kitty Hawk" and "Constellation") and 1 "Forrestal" class ("Independence").

II. Fleet Aviation

The fleet aviation also adopts two types of organization: administrative grouping and task grouping. The administrative group is generally organized according to a single type of aircraft, which is responsible for daily administrative management, flight training, and material and technical support, etc., and the task group is a multi-type mixed group to meet the needs of carrying out specific tasks. The fleet aviation is divided into three levels: wings (brigades), squadrons, and detachments according to administrative grouping. The wing is the basic administrative and tactical unit of the fleet aviation, which has 6~12 squadrons under its jurisdiction, and is divided into the fleet aviation wing and the carrier-based aircraft wing. The fleet aviation wing, also known as the shore-based aviation wing, includes the patrol aircraft wing (composed of 6~7 squadrons, each squadron is equipped with 9 P-3C shore-based anti-submarine patrol aircraft), attack aircraft wing (composed of 8~14 squadrons, each squadron is equipped with 14 A-6E attack aircraft), fighter wing (composed of more than 10 squadrons, each squadron is equipped with 12 F-14A fighters), combat attack aircraft wing (composed of more than 10 squadrons, each squadron is equipped with 12 F/A-18 attack fighters), Helicopter anti-submarine combat aircraft wing, reconnaissance and attack aircraft wing, mothership alert wing and tactical support wing, etc.

The Carrier-based Aircraft Wing is an administrative and tactical combat unit that uses an aircraft carrier as its base of activity. At present, the US military has a total of 10 active carrier-based aircraft wings and one reserve carrier-based aircraft wing. A typical carrier-based aircraft wing is composed of two fighter squadrons, each equipped with 10~12 F-14A fighters; two fighter attack aircraft squadrons, each equipped with 9~12 F/A-18 combat attack aircraft; one tactical electronic warfare squadron, equipped with several EA-6B electronic warfare aircraft; one squadron of airborne early warning aircraft, equipped with 4~5 E-2C early warning aircraft; in addition, the aircraft carrier is also equipped with several KA-6 tankers, S-3 and SH-3 anti-submarine planes, and helicopters.

3. Maritime Service Forces

The maritime service unit mainly includes maritime support units and maritime transport units, with 1,000 military personnel, 6,000 civilian employees, and 2,500 contract commercial personnel; and has a core ship composed of more than 110 amphibious, logistical, and transport vessels, organized into brigades, squadrons, and detachments.

Fourth, shore-based forces

Shore-based forces mainly refer to naval bases (including ship bases and naval air stations) and their subordinate units and institutions.

5. Marines

The Marine Corps is an amphibious combat unit subordinate to the Admiralty and has its own independent organizational system, consisting of ground combat forces and aviation. The ground combat forces are further divided into two parts: the Marine Corps and the Security Guard Corps, of which the Marine Corps is the core force of the Marine Corps. It is mainly equipped with 403 tanks, 1,966 light armored vehicles, 789 towed guns, 2,373 anti-tank missile launchers, 475 combat aircraft, and 156 helicopter gunships.

The Marine Corps consists of the Pacific Fleet Marine Corps and the Atlantic Fleet Marine Corps. The Marine Corps of the Two Ocean Fleet is administratively under the command of the Marine Corps Command, and operationally under the command of the Two Ocean Fleet. The Pacific Fleet Marine Corps is under the jurisdiction of the 1st (headquarters is located at Pendleton Barracks, California) and the 3rd Expeditionary Force (headquarters is located at Butler Barracks, Okinawa, Japan), and the Atlantic Fleet Marine Corps is under the jurisdiction of the 2nd Expeditionary Force (headquarters is located at Virginia, Lezhin Barracks), and each expeditionary force has one Marine Division, one Marine Aviation Wing, and one service support group. At present, the 1st, 2nd, and 3rd Marine Divisions have a total of three marine divisions on active duty, which are respectively subordinate to the 1st, 2nd, and 3rd Expeditionary Forces, and the establishment of the Marine Division is 18,335 personnel (including about 800 naval personnel), which is organized into three regiments, divided into divisions, regiments, battalions, companies, and platoons; and is composed of units directly under the division, combat units, and combat support units. The units directly under the command are composed of divisional battalion headquarters, reconnaissance battalions, tank battalions, infantry battalions, amphibious assault battalions, and engineer battalions; the combat units are three marine regiments and the combat support units are one artillery regiment.

The security guard unit is mainly responsible for the security and security work of the navy's armed ships, base facilities, and State Council embassies and consulates abroad, accounting for about 8 percent of the total strength of the Marine Corps.

The Marine Aviation Corps is organized into three levels: wings, brigades, and squadrons, and has a total of three wings, each of which is assigned to three expeditionary units. The establishment of the wing is 12,000 people, and there are 4 aviation groups, 1 aviation control group and 1 support group, 28~31 squadrons, as well as several light anti-aircraft missile battalions and anti-aircraft artillery companies and other ground air defense units. Among them, 60 AV-8B attack planes, 48 F/A-18 fighter-attack planes, 20 A-6E attack planes, 6 EA-6B electronic warfare planes, 8 RF-4B reconnaissance planes, 12 KC-130 tanker planes, 12 OV-10A/D observation planes, 24 AH-1T/attack helicopters, 48 CH-53 helicopters, 60 CH-46E helicopters, 24 UN-IN utility helicopters, and 16 "Hawk" missile launchers.

6. Coast Guard

It is mainly responsible for port security, navigation assistance, search and rescue, anti-narcotics and other tasks, and is under the leadership of the Ministry of Transport; in wartime, it is under the command of the Navy, and is responsible for escorting the maritime transport fleet, carrying out anti-submarine missions, and providing crews for naval ships. There are 2 regional commands (Atlantic Regional Command and Pacific Regional Command) and 10 Coast Guard District Commands. It is equipped with 146 patrol vessels, 73 aircraft and 136 helicopters.