Destroyer Leader (DL) was the United States Navy designation for large destroyers from 9 February 1951 through the early years of the cold war. United States ships with hull classification symbol DL were officially frigates from 1 January 1955 until 1975. The smaller destroyer leaders were reclassified as destroyers and the larger as cruisers by the United States Navy 1975 ship reclassification; so destroyer escorts could be reclassified as frigates (FF) in conformance with international usage of the term.
By the end of World War I the destroyers intended to screen formations of battleships had evolved to a displacement of approximately 1100 tons armed with four 4 inches (10 cm) guns and six or more torpedoes. Italy had built three esploratori scout cruisers approximately 70% larger than contemporary destroyers. The Washington Naval Treaty encouraged United Kingdom satisfaction with its traditional fleet of V and W-class destroyers and United States contentment with similar Wickes and Clemson-class destroyers, while the signatories with smaller fleets explored alternative warship configurations between the classical definitions of destroyer and cruiser. Italy launched three more esploratori and France responded with six contre-torpilleur super destroyers. Japan launched the minimum light cruiser Yūbari followed by the special type destroyers 特型 (Tokugata?) with endurance to escort the Kido Butai mobile force of aircraft carriers over the wide reaches of the Pacific.
Germany built similarly enlarged zerstörer when it commenced naval rearmament. With the exception of the Tribal-class and a few flotilla leaders, most British and American destroyers built between the world wars were smaller than contemporary Axis destroyers; but as the battleships for which the smaller destroyers had been designed faded into restricted roles in the combat experience of World War II, United States destroyer displacement increased to 2100-tons, 2200-tons, and 2400-tons to support Fast Carrier Task Force operations.
As the United States Navy thinned its wartime fleet following second world war hostilities, the smaller destroyers were discarded until only those over 2,000 tons remained in active service. Naval architects had a few years to evaluate captured ships and combat experience before there was any need for more warships. With large inventories of destroyers and cruisers, new surface warship designs explored placing high-efficiency boilers in hulls of intermediate size. The first destroyer leader USS Norfolk was authorized in 1948 and laid down in 1949 as an anti-submarine hunter killer cruiser based on the Atlanta-class anti-aircraft cruiser. She was designated EDL-1 while engaged in experimental work with new sensors and weapons systems including SQS-23 Sonar, Weapon Alpha, RUR-5 ASROC and automatic 3"/70 Mark 26 guns. She served entirely in the Atlantic except for a single deployment to the Indian Ocean and cruise around the world in 1968 shortly before she was retired from active service. A sister ship was authorized, but not completed after experience with the prototype did not justify repetition of the design.
The next design was for an unarmored cruiser of displacement similar to Italian Capitani Romani-class cruisers to carry the new 5"/54 caliber Mark 42 gun. The first two of the four Mitscher-class ships were powered by Combustion Engineering boilers and General Electric turbines. They were fitted with improved sensors and RIM-24 Tartar missiles during overhaul at the Philadelphia Naval Shipyard from 1966 to 1968 and reclassified as guided missile destroyers in 1975. The latter two ships powered by Foster Wheeler boilers and Westinghouse turbines spent their final years as test platforms for the SQS-26 Sonar before retirement when their sisters emerged from overhaul at Philadelphia in 1968.
The third class were designed as destroyer leaders, but authorized after the name change to frigate, and involved several weapons system changes over the period of construction. The first three ships were ordered with three 5"/54 caliber guns, while the next three were ordered with two 5"/54 guns forward and a RIM-2 Terrier missile system aft. All ten ships were completed with a single 5"/54 gun forward, an ASROC launcher where the B gun would have been, and the missile system aft; but the class was variously named Coontz for the first ship to be ordered with a missile system, or Farragut for the lowest numbered ship to be completed in that configuration. All were reclassified as guided missile destroyers in 1975.
Comparison of ships with similar missions
|Mirabello-class||1917||3||Italy||1,811 tons||35 knots||8 × 4 inches (10 cm) guns||4|
|Yūbari||1923||1||Japan||2,890 tons||35 knots||6 × 14 centimetres (5.5 in) guns||4|
|Leone-class||1924||3||Italy||1,743 tons||34 knots||8 × 12 centimetres (4.7 in) guns||4|
|Chacal-class||1926||6||France||2,126 tons||35 knots||5 × 13 centimetres (5.1 in) guns||6|
|Fubuki-class||1927||20||Japan||2,090 tons||34 knots||6 × 12.7 cm/50 Type 3 naval gun||9|
|Guépard-class||1929||18||France||2,441 tons||35 knots||5 × Canon de 138 mm Modèle 1927||7|
|Navigatori-class||1929||12||Italy||1,900 tons||38 knots||6 × 12 centimetres (4.7 in) guns||6|
|Akatsuki-class||1931||4||Japan||2,090 tons||38 knots||6 × 12.7 cm/50 Type 3 naval gun||9|
|Porter-class||1935||8||US||1,850 tons||37 knots||8 × 5"/38 caliber gun||8|
|Le Fantasque-class||1936||6||France||2,569 tons||37 knots||5 × Canon de 138 mm Modèle 1929||9|
|Asashio-class||1936||10||Japan||1,961 tons||35 knots||6 × 12.7 cm/50 Type 3 naval gun||8|
|Tribal-class||1936||27||UK||1,870 tons||36 knots||8 × 4.7 inch QF Mark XII gun||4|
|Zerstörer 1934||1937||16||Germany||2,200 tons||38 knots||5 × 12.7 cm SK C/34 naval guns||8|
|Somers-class||1937||5||US||1,850 tons||37 knots||8 × 5"/38 caliber gun||12|
|Kagerō-class||1938||18||Japan||2,033 tons||35 knots||6 × 12.7 cm/50 Type 3 naval gun||8|
|Tromp-class||1938||2||Netherlands||3,787 tons||32 knots||6 × 15 centimetres (5.9 in) guns||6|
|Zerstörer 1936||1938||6||Germany||2,400 tons||38 knots||5 × 12.7 cm SK C/34 naval guns||8|
|Mogador-class||1939||2||France||2,994 tons||39 knots||8 × Canon de 138 mm Modèle 1929||10|
|L and M-class||1939||16||UK||1,920 tons||36 knots||6 × 4.7 inch QF Mark XII gun||8|
|Zerstörer 1936A||1940||15||Germany||2,600 tons||38 knots||4 × 15 cm TbtsK C/36 naval guns||8|
|Yūgumo-class||1941||20||Japan||2,077 tons||35 knots||6 × 12.7 cm/50 Type 3 naval gun||8|
|Gerard Callenburgh-class||1941||2||Netherlands||1,922 tons||36 knots||5 × 12 centimetres (4.7 in) guns||8|
|Akizuki-class||1942||12||Japan||2,701 tons||33 knots||8 × 10 cm/65 Type 98 naval gun||4|
|Shimakaze||1942||1||Japan||2,567 tons||39 knots||6 × 12.7 cm/50 Type 3 naval gun||15|
|Fletcher-class||1942||175||US||2,050 tons||37 knots||5 × 5"/38 caliber gun||10|
|Capitani Romani-class||1942||4||Italy||3,750 tons||36 knots||8 × 13.5 centimetres (5.3 in) guns||8|
|Allen M. Sumner-class||1943||58||US||2,200 tons||36 knots||6 × 5"/38 caliber gun||10|
|Gearing-class||1944||98||US||2,425 tons||35 knots||6 × 5"/38 caliber gun||10|
|Battle-class||1944||26||UK||2,315 tons||35 knots||4 × QF 4.5-inch Mk III naval gun||10|
|DL-1||1953||1||US||5,600 tons||32 knots||8 × 3"/70 Mark 26 gun||4 + Mk 32|
|DL-2 class||1953||4||US||3,675 tons||35 knots||2 × 5"/54 caliber Mark 42 gun||4 + Mk 32|
|DL-6 class||1960||10||US||4,700 tons||34 knots||1 × 5"/54 caliber Mark 42 gun||Mk 32|
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