Design and capability of aircraft carriers during World War II
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Naval historians such as Evan Mawdsley, Richard Overy, and Craig Symonds concluded that World War II's decisive victories on land could not have been won without decisive victories at sea.[1][2][3]Naval battles to keep shipping lanes open for combatant's movement of troops, guns, ammunition, tanks, warships, aircraft, raw materials, and food largely determined the outcome of land battles. Without the Allied victory in keeping shipping lanes open during the Battle of the Atlantic, Britain could not have fed her people or withstood Axis offensives in Europe and North Africa.[4][failed verification] Without Britain's survival and without Allied shipments of materiel, food and industrial equipment to the Soviet Union,[a] her military and economic power would likely not have rebounded in time for the Red Army to prevail at Stalingrad and Kursk.[5][6][7][unreliable source?][8][9]
Without victories at sea in the Pacific theater, the Allies could not have mounted amphibious assaults on or maintained land forces on Guadalcanal, New Guinea, Saipan, The Philippines, Iwo Jima, or Okinawa. Allied operations in the Atlantic and Pacific war theaters were interconnected because they frequently competed for scarce naval resources for everything from aircraft carriers to transports and landing craft.[10] Effective transport of troops and military supplies between the two war theaters required naval protection for shipping routes around the Cape of Good Hope, through the Suez canal, and through the Panama Canal. In both theaters, maritime dominance enabled combatants to use the sea for their own purposes and deprive its use by adversaries. As naval historian Admiral Herbert Richmond stated, "Sea power did not win the war itself: it enabled the war to be won".[11]
Aircraft carriers played a major role in winning decisive naval battles,[12] supporting key amphibious landings, and keeping critical merchant shipping lanes open for transporting military personnel and their equipment to land battle zones.
Design considerations[]
Aircraft carrier design involved trade-offs between offensive striking power and defensive survivability. The more carrier tonnage allocated to guns and armor for protection, the less was available for carrying and launching aircraft, the warship's principal weapon. Combatant nations of World War II placed varying emphasis on these factors depending upon conditions in their principal operating theater, their preferred operating tactics, and their industrial capability. Experts continue to debate whether increasing carrier survivatility through increased anti-aircraft armament and armored flight decks was optimal during World War II since adding the weight to do so necessitated reductions in the number of carrier aircraft available to inflict damage upon the enemy. For example, would designing the USS Yorktown so that it was more likely to survive the punishment it took at the Battle of Midway have been desirable if its carrying a smaller air group resulted in fewer Japanese carriers being sunk?[13]
Initial constraints on design[]
Aircraft carrier design prior to the outbreak of World War II had been constrained by limitations of international agreements among the major naval powers which were intended to avoid an arms race over capital ships. The Washington Naval Treaty of 1922 limited individual carrier displacement for the five parties to 27,000 long tons, except that each could convert up to two existing battleship hulls to carriers with displacements up to 33,000 tons. Armament for carriers was limited to a maximum of ten guns with a maximum caliber of 8 inches (203 mm). Aircraft carriers were defined as having displacements of at least 10,000 tons and used exclusively for launching and landing aircraft. The total tonnage limit for carriers was 135,000 tons for UK and America, 81,000 for Japan, and 60,000 tons for Italy and France.[14] Any carrier built could not be replaced for twenty years but carriers already built were deemed "experimental" and could be replaced at any time. Carriers under 10,000 tons were not included in the definition. .[15]
"Experimental" designs[]
Only four aircraft carriers were in service or under construction at the time the Washington Naval Treaty was agreed to. These four were considered "experimental" and not included as part of the treaty's overall tonnage limitations. They were relatively small in size and carried a relatively small number of aircraft. These were HMS Argus (the first full deck aircraft carrier), USS Langley (a converted collier), IJN Hōshō (the first purpose built carrier to enter service), and HMS Hermes (the first purpose designed carrier).[b]
Evolving design emphasis by each combatant[]
Japanese aircraft carriers[]
The Imperial Japanese Navy (IJN) emphasized offensive capability consistent with their strategic vision of orchestrating and winning a single, decisive battle. Limited by treaties to having fewer capital ships than the US and UK, Japan's planning emphasized ways to degrade enemy fleets before they arrived at battle by extending the capability of IJN weapon systems. Aircraft as well as torpedoes had longer ranges than American or British counterparts.
The following table shows some key performance parameters for Japanese aircraft carriers. Carriers are listed in order of commissioning date within each carrier type (fleet, light, escort).
Commission date[d] | Class | Standard displacement[e] |
Length (ft) |
Speed (kn) |
Range (nmi)[f] |
Crew | Operational
aircraft[g] |
Reserve
aircraft |
Lost to | ||
---|---|---|---|---|---|---|---|---|---|---|---|
Fleet carriers | |||||||||||
1 | Akagi | 25-May-27 | Akagi | 36,500 | 855 | 31 | 8,200 | 1,630 | 66 | 15 | 1 bomb[h] |
2 | Kaga | 30-Nov-29 | Kaga | 38,200 | 812 | 28 | 10,000 | 1,708 | 72 | 18 | 4 bombs |
3 | Soryu | 29-Sep-37 | Soryu | 15,900 | 746 | 34 | 7,750 | 1,103 | 63 | 8 | 3 bombs |
4 | Hiryu | 05-Jul-39 | Soryu | 17,300 | 746 | 34 | 10,330 | 1,103 | 57 | 16 | 4 bombs |
5 | Shokaku | 08-Aug-41 | Shokaku | 26,675 | 845 | 34 | 9,700 | 1,660 | 72 | 12 | 4 torpedoes |
6 | Zuikaku | 25-Sep-41 | Shokaku | 29,800 | 845 | 34 | -- | 1,660 | 72 | 12 | 9 bombs+7 torp |
7 | Junyo | 03-May-42 | Hiyo | 24,100 | 718 | 25.5 | 10,000 | 1,224 | 48 | 5 | -- |
8 | Hiyo | 31-Jul-42 | Hiyo | 26,949 | 718 | 25.5 | 10,000 | 1,224 | 48 | 5 | 2 torpedoes |
9 | Taiho | 07-Mar-44 | Taiho | 29,300 | 855 | 33 | 10,000 | 1,751 | 75 | 0 | 1 sub. torpedo |
10 | Unryu | 06-Aug-44 | Unryu | 17,150 | 742 | 34 | 8,000 | 1,595 | 57 | 6 | 2 sub. torpedoes |
11 | Amagi | 10-Aug-44 | Unryu | 17,460 | 742 | 34 | 9,700 | 1,595 | 57 | 6 | many bombs |
12 | Katsuragi | 15-Oct-44 | Unryu | 17,260 | 742 | 33 | 9,700 | 1,595 | 57 | 6 | -- |
13 | Shinano | 19-Nov-44 | Shinano | 64,800 | 873 | 27 | 10,000 | 2,400 | 47 | 0 | 4 sub. Torpedoes |
Light carriers | |||||||||||
1 | Hosho | 27-Dec-22 | Hosho | 7,470 | 551 | 25 | 8,680 | 550 | 21 | 0 | -- |
2 | Ryujo | 09-May-33 | Ryujo | 12,732 | 590 | 29 | 10,000 | 924 | 48 | 0 | 4 bm+1 torp |
3 | Zuiho | 27-Dec-40 | Zuiho | 11,262 | 712 | 28 | 9,236 | 785 | 30 | 0 | many bm +2 torp |
4 | Shoho | 30-Nov-41 | Zuiho | 11,262 | 674 | 28 | 9,236 | 785 | 30 | 0 | 13 bm+7 torp |
5 | Ryuho | 28-Nov-42 | Ryuho | 13,360 | 707 | 26 | 8,000 | 989 | 30 | 0 | -- |
6 | Chitose | 01-Nov-43 | Chitose | 11,190 | 631 | 29 | 11,000 | 1,500 | 30 | 0 | 3 torpedoes |
7 | Chiyoda | 21-Dec-43 | Chitose | 11,190 | 631 | 29 | 11,810 | 1,500 | 30 | 0 | 4 bombs + gunfire |
Escort carriers | |||||||||||
1 | Taiyo | 15-Sep-41 | Taiyo | 17,830 | 591 | 21 | 8,500 | 850 | 23 | 4 | 1 sub. torpedo |
2 | Unyo | 31-May-42 | Taiyo | 17,830 | 649 | 21 | 8,500 | 850 | 30 | 0 | 1 sub. torpedo |
3 | Chuyo | 25-Nov-42 | Taiyo | 17,830 | 591 | 21 | 8,500 | 850 | 30 | 0 | 2 sub. Torpedoes |
4 | Shinyo | 15-Nov-43 | Shinyo | 17,500 | 651 | 22 | 8,000 | 948 | 27 | 6 | 4 sub. Torpedoes |
5 | Kaiyo | 23-Nov-43 | Kaiyo | 13,600 | 546 | 23 | 7,000 | 587 | 24 | 0 | bombs |
RANGES | |||||||||||
Fleet | |||||||||||
Low | 15,900 | 718 | 26 | 7,750 | 1,103 | 48 | 0 | ||||
High | 64,800 | 873 | 34 | 10,000 | 2,400 | 75 | 18 | ||||
Light | |||||||||||
Low | 7,470 | 551 | 25 | 8,000 | 550 | 21 | 0 | ||||
High | 13,360 | 712 | 29 | 11,810 | 1,500 | 48 | 0 | ||||
Escort | |||||||||||
Low | 13,600 | 546 | 21 | 7,000 | 587 | 23 | 0 | ||||
High | 17,830 | 651 | 23 | 8,500 | 948 | 30 | 6 |
Notes:
- This table includes only ships that operated between July 1937 and August 1945 and that had flight decks for both launching and recovering aircraft at sea.
American aircraft carriers[]
Americans perceived their principal operating theater would be the Pacific, where immense distances between refueling bases placed a premium on carrier speed and range. Threats were likely to come from other warships, either as enemy aircraft or ship's guns, rather than from land-based planes or batteries. Carrier-launched strikes would involve fewer aircraft and each would carry less of a payload, consisting of 250lb and 500lb bombs, compared to land-based aircraft. Also, war-games indicated the ability to strike first and decisively was important for success. Strong first strikes against enemy carriers were expected to reduce or eliminate their ability to counter-attack, reducing the need for strong defensive measures. As a result of these considerations, Americans placed greater emphasis on aircraft striking power than upon survivability when attacked. Accordingly, carriers were designed to carry more aircraft and aircraft components at the expense of more anti-aircraft guns and flight deck armor. To further increase the number of aircraft carried, large numbers of them were kept on the flight deck in addition to those kept below in hangars. In the Pacific, storms that could toss or wash deck-park aircraft overboard were uncommon and could theoretically be navigated around. Finally, within a year of the beginning of the Pacific War, America's industrial capacity enabled them to rapidly make good their carrier losses, enabling them to take greater risks with their carriers to achieve greater success.[13]
British aircraft carriers[]
The British also operated in the Pacific but, for most of the war, their principal areas of carrier operation were the coastal Atlantic, Mediterranean, and North Sea. In these areas, there were no enemy carriers. The threat was from land-based, potentially multi-engine, heavy bombers in potentially overwhelming numbers that could deliver heavy payloads consisting of 1,000lb bombs or more and be protected by equally large numbers of fighter aircraft. Unlike with relatively few and small enemy attacking aircraft in the Pacific, it was almost assured that some attacking aircraft would penetrate a fighter and anti-aircraft screen. Further, attacks from land bases could be sustained after airfield repairs, unlike in the Pacific where the launch platform could be sunk or sufficiently damaged to require an immediate return to dry-dock facilities. Accordingly, emphasis was placed on surviving an attack such that a counter-attack could be launched. Survivability was enhanced with more anti-aircraft guns and flight deck armor at the expense of larger aircraft groups on board. Additional anti-aircraft armament also made carriers more self-sufficient for defense and less reliant upon other warships for screening. Finally, heavy weather was more common and less avoidable in the Atlantic theater than in the Pacific. and deck-parking to increase aircraft group size was less common.[13]
All carriers[]
The table below shows the specifications and capabilities for aircraft carriers of all combatants as they evolved over time. During the war, warships received modifications and upgrades, including increasing anti-aircraft guns. There were other aircraft carrier designs built during the war which only entered service just prior to or after the end of hostilities such as the British Light Fleet Carrier, or the US Midway-class. There were also cancelled carriers such as the French Joffre-class, British Malta-class, the German "Aircraft carrier II" or Jade-class.
Carrier | Date comm. | Carrier class | Country | Std. displ | Full Displ | Length w/l (ft) |
Length o/a (ft) |
Beam o/a (ft) |
Draft (ft) |
Speed (kn) | Range (nmi) | H. AA | L. AA | Belt Arm. | Deck Arm. | Aircraft | Crew |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
HMS Argus | 1918 | UK | 14,680 | 16,028 | 565 | 68 | 23 | 20 | 3,600 | 6 | 15-18 | 495 | |||||
USS Langley | 1922 | Langley | US | 12,900 | 14,100 | 542 | 65 | 25 | 16 | 3,500 | 4 | 36 | 631 | ||||
IJN Hōshō CVL | 1922 | Japan | 7,590 | 9,646 | 552 | 59 | 20 | 25 | 8,680 | 6 | 15 | 512 | |||||
HMS Hermes CVL | 1923 | UK | 11,020 | 13,900 | 600 | 70 | 23 | 25 | 5,600 | 9 | 3 | 1 | 20 | 566 | |||
HMS Eagle | 1924 | converted battleship | UK | 22,200 | 668 | 115 | 27 | 24 | 4,800 | 14 | 4.5 | 1-1.5 | 25-30 | 791 | |||
HMS Furious | 1925 | modified Courageous | UK | 22,900 | 26,000 | 787 | 88 | 25 | 30 | 7,480 | 16 | 2-3 | .8-3 | 36 | 795 | ||
IJN Akagi | 1927 | Japan | 37,100 | 42,000 | 855 | 103 | 29 | 32 | 10,000 | 12 | 14 | 6 | 3.1 | 66 | 1,630 | ||
USS Saratoga | 1927 | Lexington | US | 37,000 | 43,746 | 888 | 106 | 30 | 33 | 10,000 | 20 | 5-7 | .8-2 | 78 | 2,791 | ||
USS Lexington | 1927 | Lexington | US | 37,000 | 48,500 | 888 | 108 | 33 | 33 | 10,000 | 20 | 5-7 | .8-2 | 78 | 2,791 | ||
Béarn | 1927 | France | 22,501 | 29,000 | 599 | 116 | 31 | 22 | 7,000 | 14 | 16 | 3.1 | 1 | 35-40 | 865 | ||
HMS Courageous | 1928 | Courageous | UK | 24,600 | 27,420 | 735 | 786 | 91 | 28 | 30 | 6,630 | 16 | 2-3 | .8-3 | 48 | 1,217 | |
IJN Kaga | 1929 | Japan | 38,813 | 812 | 33 | 31 | 28 | 10,000 | 26 | 22 | 6 | 1.5 | 90 | 1,708 | |||
HMS Glorious | 1930 | Courageous-class | UK | 25,370 | 27,859 | 735 | 787 | 91 | 28 | 30 | 5,860 | 16 | 2-3 | .8-1 | 48 | 1,283 | |
IJN Ryujo CVL | 1933 | Japan | 7,900 | 9,990 | 590 | 67 | 18 | 29 | 10,000 | 12 | 24 | 48 | 600 | ||||
USS Ranger | 1934 | US | 14,810 | 17,859 | 730 | 769 | 109 | 22 | 29 | 10,000 | 8 | 40 | 2 | 1* | 86 | 2,461 | |
IJN Sōryū | 1937 | Japan | 16,200 | 19,100 | 748 | 70 | 25 | 34 | 7,750 | 6 | 14 | 63+9 | 1,100 | ||||
USS Yorktown | 1937 | Yorktown | US | 20,100 | 25,900 | 825 | 109 | 26 | 33 | 12,500 | 8 | 40 | 2.5-4 | 80-90 | 2,217 | ||
USS Enterprise | 1938 | Yorktown | US | 19,800 | 25,500 | 770 | 825 | 110 | 26 | 33 | 12,500 | 8 | 40 | 2.5-4 | 90 | 2,217 | |
HMS Ark Royal | 1938 | UK | 22,000 | 28,160 | 722 | 800 | 95 | 28 | 30 | 7,600 | 16 | 64 | 4.5 | .8-3.5 | 50-60 | 1,580 | |
IJN Hiryū | 1939 | Japan | 17,600 | 29,570 | 746 | 73 | 26 | 34 | 10,330 | 12 | 21 | 3.5-6 | 1-2.2 | 64+9 | 1,100 | ||
USS Wasp | 1940 | Wasp | US | 14,900 | 19,423 | 688 | 741 | 109 | 20 | 30 | 12,000 | 8 | 30 | 3.5 | 100 | 2,167 | |
HMS Illustrious | 1940 | Illustrious | UK | 23,369 | 710 | 740 | 96 | 29 | 30 | 10,700 | 16 | 48 | 4.5 | 3.0 | 36-57 | 1,299 | |
HMS Formidable | 1940 | Illustrious | UK | 23,369 | 710 | 740 | 96 | 29 | 30 | 10,700 | 16 | 48 | 4.5 | 3.0 | 36-57 | 1,299 | |
IJN Shōkaku | 1941 | Shōkaku | Japan | 26,087 | 32,620 | 845 | 85 | 34 | 9,700 | 16 | 32 | 72 | 1,660 | ||||
USS Essex | 1942 | Essex | US | 27,500 | 36,960 | 872 | 148 | 33 | 20,000 | 12 | 78 | 3-4 | 1.5 | 95 | 2,600 | ||
HMS Implacable | 1944 | Implacable | UK | 32,630 | 767 | 96 | 33 | 6,720 | 16 | 104 | 4.5 | 3.0 | 48-81 | 2,300 |
SELECTED ESCORT CARRIERS
Long Island aircraft: 16 hangar + 46 flight deck Audacity: no hangar; aircraft stored on flight deck
Carrier Name | Date Comm. | Carrier Class | Std. Displ | Full Displ | Length f/d | Length o/a | Beam o/a | Draft | Speed (kn) | Range (nmi) | H. AA | L. AA | Belt Arm. | Deck Arm. | Air- craft | Men | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
USS Long Island | June 1941 | Long Island | 404 | 492 | 70 | 25 | 17 | 10,000 | 62 | 856 | |||||||
HMS Audacity | June 1941 | converted cargo liner | 12,000 | 450 | 467 | 56 | 28 | 15 | 1 | 9 | 6+8 | 480 | |||||
IJN Taiyō | Sep 1941 | Taiyō | 18,116 | 20,321 | 591 | 73 | 25 | 21 | 8,500 | 8 | 14 | 27-30 | 850 | ||||
IJN Un'yō | May 1942 | Taiyō | 18,116 | 20,321 | 591 | 73 | 25 | 21 | 8 | 8 | 30 | 850 | |||||
USS Sangamon | August 1942 | Sangamon | 11,600 | 24,665 | 553 | 114 | 32 | 18 | 2 | 20 | 25 | 830 | |||||
USS Bogue | September 1942 | Bogue[i] | 9,800 | 496 | 112 | 26 | 18 | 2 | 24 | 890 | |||||||
IJN Chūyō | November 1942 | Taiyō | 18,116 | 591 | 73 | 25 | 21 | 8,500 | 8 | 8 | 30 | 850 | |||||
USS Casablanca | Jul 1943 | Casablanca | 7,900 | 11,077 | 490 w/l | 498 | 65-108 | 22 | 19 | 10,240 | 1 | 20 | 27 | 916 | |||
HMS Pretoria Castle | July 1943[j] | converted liner | 23,450 | 594 | 76 | 29 | 18 | 21 | |||||||||
IJN Shin'yō | November 1943 | converted liner | 17,500 | 20,586 | 621 | 26 | 26 | 22 | 8 | 30 | 27+6 | 942 | |||||
IJN Kaiyō | November 1943 | 13,600 | 16,483 | 546 | 71 | 26 | 23 | 7,000 | 8 | 24 | 24 | 829 | |||||
HMS Vindex | December 1943 | Nairana | 13,671 | 524 | 68 | 21 | 17 | 2 | 32 | 15-20 | 700 | ||||||
HMS Nairana | Dec 1943 | Nairana | 14,280 | 529 | 69 | 21 | 17 | 2 | 32 | 15-20 | 728 | ||||||
USS Commencement Bay | Nov 1944 | Commencement Bay | 11,100 | 557 | 75 | 31 | 2 | 36 | 34 | 1,066 |
Footnotes[]
- ^ Britain and America shipped war-sustaining goods to the Soviet Union via Arctic Ocean, Persian Gulf, and Pacific Ocean routes.
- ^ construction of Hermes started in 1918 but her design was being modified as a result of experiments with Argus and Eagle; the last revisions made in 1921 and it was not commissioned until 1924 [16]
- ^ Values shown here are typically for the 1942 to 1944 time frame
- ^ The date first commissioned as an aircraft carrier
- ^ the weight - in tons - of the ship with full load of stores and ammunition, but with no fuel, lubricating oil, or reserve feed water. [17]
- ^ the maximum distance in nautical miles possible on a load of fuel at optimal speed, which is typically much less than maximum speed.
- ^ the number that could be launched for attacks or combat air patrol. It excludes spares and cargo aircraft.[18]
- ^ Set fires which became out of control. Scuttled the following day
- ^ Attacker-class in British service
- ^ used for trials and training only
Citations[]
- ^ Mawdsley, Evan (2019). The War For The Seas- A Maritime History of World War II. London: Yale University Press. p. 478. ISBN 978-0-300-19019-9.
- ^ Overy, p. 61
- ^ Symonds, Craig L. (2018). World War II At Sea. United States: Oxford University Press. p. 641. ISBN 9780190243678.
- ^ Overy, Richard (1995). Why The Allies Won. New York, NY: W.W. Norton & Company. p. 18. ISBN 0-393-03925-0.
- ^ Overy p. 19, 254, 321
- ^ Mawdsley, p.478
- ^ Baranov, Sergey (14 March 2018). "Lend-Lease: How American supplies aided the USSR in its darkest hour". Russia Beyond. TV-Novosti. Archived from the original on 2016-03-20. Retrieved 29 August 2019.
- ^ Hill, Alexander (July 2008). "Did Russia Really Go It Alone- How Lend-Lease Helped The Soviets Defeat The Germans". History.net. Retrieved 28 Aug 2019.
- ^ Toland, John (1965). The Last 100 Days. New York, NY & Toronto, Canada: Bantam Books. p. 102. ISBN 0-553-34208-8.
- ^ Symonds, WWII at Sea, p. xi-xii
- ^ Mawdsley, page=xxxix, 477
- ^ Symonds, p. 268
- ^ a b c Pocklington, Alexander (aka "Drachinifel") (2 Jan 2019). "'Armoured' and 'Unarmoured' Carriers: Survivability vs. Strike Power". Five Minute Guide To Warships WWI & WWII (more or less). Retrieved 31 Mar 2019 – via YouTube.
- ^ DiGiulian, Tony (29 December 2017). "Washington Naval Limitation Treaty of 1922". NavWeaps. Retrieved 31 Mar 2019.
- ^ Article XX part 4, Article VIII
- ^ Friedman, 1988 p83-84
- ^ Stille, p. 61
- ^ Parshall and Tully, p. 478
References[]
- Chen, C. Peter. "World War II Database". Lava Development. Retrieved 22 January 2022.
- Cocker, Maurice (2008). Aircraft-Carrying Ships of the Royal Navy. Stroud, Gloucestershire: The History Press. ISBN 978-0-7524-4633-2.
- Friedman, Norman (1988). British Carrier Aviation: the Evolution of the Ships and their Aircraft. London: Conway Maritime Press. ISBN 978-0-85177-488-6.
- Parshall, Jonathan B.; Tully, Anthony P. (2005). Shattered Sword. United States: Potomac Books. ISBN 1-57488-923-0.
- Stille, Mark (2013). The Imperial Japanese Navy In The Pacific War. New York, NY: Osprey Publishing. ISBN 978 1 4728 0146 3.
- Symonds, Craig L. (2018). World War II At Sea. New York, New York: Oxford University Press. ISBN 9780190243678.
- Tully, Anthony (27 September 2021). "Kido Butai!- Stories and Battle Histories of the IJN's Carrier Fleet". Imperial Japanese Navy Page. CombinedFleet.com. Retrieved 22 January 2022.
- "DANFS Online- The Dictionary of American Naval Fighting Ships". Haze Gray & Underway. Retrieved 22 January 2022.
- "Guide for individual ships histories". Naval War In The Pacific, 1941-1945. Retrieved 22 January 2022.
- Aircraft carriers
- Aviation in World War II
- Naval battles and operations of World War II