Key Points and Summary – America’s Essex-class aircraft carriers were the backbone of U.S. naval power in World War II’s Pacific War and stayed relevant for decades.
-Larger decks, stronger armor, bigger air wings, and serious anti-air defenses let 24 ships absorb terrible punishment while none were lost to enemy action.
USS Intrepid Essex-Class National Security Journal Original Image. Taken by Jack Buckby on 9/18/2025.
-Modernized for jets, Essex-class carriers flew combat in Korea and Vietnam and even recovered Apollo spacecraft before retiring, with four preserved as museums.
-Their story is simple: mass, survivability, and adaptability win wars — a lesson today’s U.S. Navy should remember as it debates the future of its carrier fleet in an increasingly dangerous world.
-Summed Up in 1 Word: Historic.
The Essex-Class Aircraft Carriers That Won the Pacific Have a Message for the U.S. Navy
The Essex-class aircraft carriers were incredible ships, acting as the backbone of US naval power in the Pacific during World War II and serving for decades afterward.
They were a significant upgrade from previous designs, featuring larger flight decks, increased air group capacity, and more anti-aircraft guns. Their robust design, adaptability, and sheer numbers—24 were completed—proved critical in winning the war, and despite sustaining heavy damage, none were lost in combat.
During World War II, 32 ships were ordered, eight canceled, 24 laid down, 17 completed early enough to see the war, and 14 actually saw combat.
None were lost to enemy action during World War II, though some were heavily damaged, especially by kamikazes late in the war. Four remain in existence today as museum ships: the Yorktown, the Hornet, the Lexington, and the Intrepid.
The Essex-class Carriers Were Freed From Treaty Limits
After Japan departed from the naval treaties in 1936, the U.S. realized it needed to bolster its maritime strength, and the Naval Expansion Act of Congress was passed on May 17, 1938, enabling a new 40,000-ton limit for aircraft carriers; the “escalator clause” also applied to battleships. This extra tonnage allowed building the Hornet as a copy-paste of the Yorktowns, as well as the new USS Essex as the lead ship of a new class.
The Essex class was designed to surpass previous carriers, offering a good balance of speed, armor, and striking power. It was freed from the restrictions of the Washington Naval Treaty after Japan rejected it, with the beginning of the Naval Expansion Act of 1938.
Essex-Class Carrier USS Intrepid NSJ Photo.
The class included both “short-hull” and “long-hull” versions, with 24 ships completed from an initial order of 32.
The Essex class was crucial to the US victory in the Pacific theater during World War II, operating in major battles and surviving kamikaze attacks. The Essex carriers swept the Japanese navy from the Pacific, giving the US the massive firepower to bring to bear an unbeatable force anywhere in the Pacific, something the Japanese could not hope to compete with.
After the war, the carriers underwent multiple modernizations and upgrades to handle the new jet aircraft and helicopters of the jet age, including angled flight decks.
They continued to form a significant part of US naval air power into the Korean and Vietnam Wars before gradually being replaced by larger classes of supercarriers.
Essex Aircraft Carrier Design
The Essex-class carriers were over sixty feet longer (888 feet), nearly ten feet wider (147.5 feet), and more than a third heavier (36,960 tons full combat load) than Yorktown-class carriers.
A longer, wider flight deck and a deck-edge elevator (which had proven successful in the one-off USS Wasp) facilitated more efficient aviation operations, enhancing the ship’s offensive and defensive air power.
The Essex carriers had better armor protection than their predecessors, improved facilities for handling ammunition, increased fuel capacity, and more effective damage control equipment.
Yet, these ships were also designed to limit weight and the complexity of construction, for instance, incorporating extensive use of flat and straight metal pieces, and of Special Treatment Steel (STS), a nickel-chrome steel alloy that provided the same protective qualities as Class B armor plate, but which was fully structural.
The Essex class was powered by eight Babcock & Wilcox boilers, 150,000 shp (110,000 kW), and propelled by Westinghouse geared turbines with four screw propellers. It had a top speed of 33 knots (38.6 mph). They had a range of 20,000 nautical miles.
Essex-class Carriers Armament
The carriers mounted twelve 5-inch (130 mm) 38 caliber guns (in 4 enclosed twin mounts located near the island on the starboard side and four single open mounts located on the port side forward and port side aft).
These guns had a maximum range of seven miles and a rate of fire of fifteen rounds per minute. The 5-inch guns could fire VT shells, proximity-fuzed shells that detonated when they came within range of an enemy aircraft.
The 5-inch guns could also aim into the water, creating waterspouts which could bring down low-flying aircraft such as torpedo planes.
There were also seventeen quadruple Bofors 40 mm anti-aircraft guns and 65 single Oerlikon 20 mm cannon. The Bofors 40 mm guns were a significant improvement over the 1.1 in/75-caliber guns mounted on the earlier Lexington and Yorktown classes. And were controlled by Mark 51 optical directors with integrated gyro gun-sight lead-angle calculators.
The Essex-class aircraft carriers carried 90 aircraft, 36 F6F Hellcat fighters, 36 Douglas SBD Dauntless dive bombers, which were later replaced by the inferior Curtiss SB2C Helldiver, and 18 of the Grumman TBF Avenger torpedo bombers.
The Essex Class Was Invaluable In the Pacific Theater
By the end of 1943, the contribution of the Essex-class aircraft carriers, together with the Independence-class carriers, dominated the seas and skies in America’s favor during the Pacific War, starting with the recapture of the Gilbert Islands.
The carriers ensured US Navy air superiority, and that marked the beginning of the end of Japanese supremacy in the Pacific. The deployment of the Essex-class carriers was a key factor in Japan’s defeat.
Japanese losses in carriers and, more importantly, the trained aircrews earlier in 1942 were never adequately replaced. With the massive influx of American carriers and highly trained aircrews, the US dominated the Pacific naval war.
The Essex-class carriers conducted air raids on Japanese-occupied islands, in the reconquest of these islands by protecting the invasion forces and in the transportation of hundreds of fighter aircraft and thousands of troops.
From late 1944, the Essex-class aircraft carriers were primarily used to attack Japan itself, a role that was later taken over by the B-29 long-range bombers.
Kamikazes Appear Over Leyte Gulf
On October 30, 1944, during the Battle of Leyte Gulf, the first recorded use of kamikazes by the Japanese was noted, as three kamikazes attacked the USS Franklin. One hit the flight deck with such force that it penetrated to the hangar deck, igniting a massive fire that killed 56 crewmen and injured 60 others.
After repairs, the Franklin returned to action and was later hit by Japanese high altitude bombers in March of 1945, with her flight deck loaded with 30 aircraft warming up and fully combat loaded. That killed 796 crewmen, bringing the total of USS Franklin fatalities during the war to nearly 1,000, which was second only to the USS Arizona, which was sunk at Pearl Harbor.
Korean And Vietnam War Service
After World War II, the Essex-class carriers were upgraded to handle the larger, heavier jet aircraft. Among these modifications were jet blast deflectors (JBDs), increased aviation fuel capacity, stronger decks, and elevators.
Also included were British innovations such as an optical landing system, steam catapults, and, ultimately, an angled flight deck.
Twenty-two of the Essex class saw extensive service during the Korean War, with 11 in battle. The Franklin mentioned above, and the Bunker Hill, which also suffered massive damage by kamikazes, were repaired but never recommissioned.
Thirteen of the Essex carriers were used in action during the Vietnam War. Several Essex-class carriers saw use in the NASA space program as recovery platforms for space aircraft returning from lunar missions.
Essex-Class USS Intrepid Radar Station Photo. Image Credit: National Security Journal.
They were all retired by the late 1970s, except for the Lexington, which served as a training carrier until 1991. Four of the Essex carriers, the Yorktown, the Lexington, the Hornet, and the Intrepid, serve as museum ships.
About the Author: Steve Balestrieri
Steve Balestrieri is a National Security Columnist. He served as a US Army Special Forces NCO and Warrant Officer. In addition to writing on defense, he covers the NFL for PatsFans.com and is a member of the Pro Football Writers of America (PFWA). His work was regularly featured in many military publications.
