Special-Purpose Craft
(YCV, YDG, YDT, YE, YFT, YH, YHB, YTT, YV)
The vessels in this table were used for a variety of specialized activities.
| Builder | Location | LOA | Tons | Built | Notes | |
| Aircraft Transportation Barges (YCV) | ||||||
| YCV-1 | later YC-1304 1945 | |||||
| YCV-2 | later YC-1305 1945 | |||||
| YCV-3 | City Lumber | Bridgeport CT | 110 | 150 | 1943 | lost 1945 |
| YCV-4 | City Lumber | Bridgeport CT | 110 | 150 | 1943 | to MARAD 1947 |
| YCV-5 | City Lumber | Bridgeport CT | 110 | 150 | 1943 | to MARAD 1947 |
| YCV-6 | 200 | 480 | 1943 | later YC-1093 1945 | ||
| YCV-7 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1943 | |
| YCV-8 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1944 | struck 1995 |
| YCV-9 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1944 | scrapped 1982 |
| YCV-10 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1944 | |
| YCV-11 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1944 | scrapped 2007 |
| YCV-12 | Pearl Harbor NY | Honolulu HI | 200 | 480 | 1944 | |
| YCV-15 | Bethlehem Steel | San Francisco CA | 200 | 480 | 1945 | to DOI 1998 |
| YCV-16 | Bethlehem Steel | San Francisco CA | 200 | 480 | 1945 | |
| YCV-17 | Bethlehem Steel | San Francisco CA | 200 | 480 | 1945 | |
| YCV-18 | Bethlehem Steel | San Francisco CA | 200 | 480 | 1945 | scrapped 1979 |
| YCV-19 | Alabama Shipyard | Mobile AL | 200 | 480 | 1990 | |
| YCV-20 | Alabama Shipyard | Mobile AL | 200 | 480 | 1990 | |
| YCV-21 | Alabama Shipyard | Mobile AL | 200 | 480 | 1990 | sold 2009 |
| YCV-22 | Alabama Shipyard | Mobile AL | 200 | 480 | 1991 | |
| YCV-23 | Alabama Shipyard | Mobile AL | 200 | 480 | 1991 | |
| Degaussing Vessels (YDG) | ||||||
| YDG-1 | Davis, M. M. | Solomons MD | 127 | 271 | 1923 | ex-Thomas C. McNeal, acquired 1942 as YP-404, sold 1945 |
| YDG-2 | San Pedro BW | San Pedro CA | 95 | 1929 | ex-Cipango, acquired 1942 as YP-504, sold 1945 | |
| YDG-3 | Parke & Kibele | San Pedro CA | 113 | 1930 | ex-Chicken of the Sea, acquired 1942 as YP-522, sold 1945 | |
| YDG-4 | Stone, W. F. | Oakland CA | 166 | 318 | 1902 | ex-Santa Monica, acquired 1942 as YP-528, lost 1943 |
| YDG-5 | Wright, E. | Tuncurry NSW, AU | 153 | 489 | 1937 | ex-Nambucca II, acquired 1943, burned 1945 |
| YDG-6 | Bellingham MR | Bellingham WA | 136 | 270 | 1943 | ex-YMS-344, lost in typhoon 1945 |
| YDG-7 | Bellingham MR | Bellingham WA | 136 | 270 | 1943 | ex-YMS-480, sold 1947 |
| YDG-8 | Albina E & MW | Portland OR | 184 | 640 | 1943 | ex-PCE-876, Lodestone (ADG-8), scrapped 1976 |
| YDG-9 | Albina E & MW | Portland OR | 184 | 640 | 1943 | ex-PCE-879, Magnet (ADG-9), sunk as target 1976 |
| YDG-10 | Albina E & MW | Portland OR | 184 | 640 | 1943 | ex-PCE-882, Deperm (ADG-10), sunk as target 1982 |
| YDG-11 | Willamette I & S | Portland OR | 184 | 640 | 1945 | ex-PCE-919/AM-359, Ampere (ADG-11), sold 1962 |
| Diving Tenders (YDT) | ||||||
| YDT-1 | W. A. Robinson | Ipswich MA | 97 | 141 | 1943 | |
| YDT-2 | W. A. Robinson | Ipswich MA | 97 | 159 | 1942 | ex-Fortitude (AMc-81) |
| YDT-3 | W. A. Robinson | Ipswich MA | 97 | 159 | 1942 | ex-Energy (AMc-78) |
| YDT-4 | W. A. Robinson | Ipswich MA | 97 | 159 | 1942 | ex-Exultant (AMc-79), sunk as target 1973 |
| YDT-5 | W. A. Robinson | Ipswich MA | 97 | 159 | 1942 | ex-Fearless (AMc-80), sunk as target 1973 |
| YDT-6 | Morse Shipyards | Thomaston ME | 93 | 159 | 1936 | ex-Blue Jay, Chas. S. Ashley, acquired 1940 as AMc-23, returned to owner 1946 |
| YDT-7 | Morse Shipyards | Thomaston ME | 93 | 159 | 1936 | ex-Canary, John J. Murley, acquired 1940 as AMc-25, to MARAD 1948 |
| YDT-8 | 64 | 1927 | ex-Washington, acquired 1940, to MARAD 1947 | |||
| YDT-9 | ||||||
| YDT-10 | ex-YFNG-1, struck 1983 | |||||
| YDT-11 | Everett Pacific | Everett WA | 261 | 700 | 1945 | ex-YFN-723, YR-94 |
| YDT-12 | Cramp Shipbuilding | Philadelphia PA | 261 | 700 | 1945 | ex-YFN-736, YRST-2 |
| YDT-13 | ||||||
| YDT-14 | Erie Concrete | Erie PA | 133 | 300 | 1942 | ex-YF-294, named Phoebus, sold 1999 |
| YDT-15 | Erie Concrete | Erie PA | 133 | 300 | 1943 | ex-YF-336, sold 1999 |
| YDT-16 | ex-YFN-1071, YFNB-43, sold 1996 | |||||
| YDT-17 | Swiftships | Morgan City LA | 132 | 275 | 1999 | later Neptune |
| YDT-18 | Swiftships | Morgan City LA | 132 | 275 | 1999 | later Poseidon |
| Ammunition Barges (YE) | ||||||
| YE-1 | Mare Island NSY | Vallejo CA | 61 | 1899 | ||
| YE-2 | Mare Island NSY | Vallejo CA | 61 | 1899 | ||
| YE-3 | Puget Sound NSY | Bremerton WA | 61 | 1901 | ||
| YE-4 | Puget Sound NSY | Bremerton WA | 61 | 1901 | ||
| YE-5 | ||||||
| YE-6 | New York NSY | Brooklyn NY | 100 | 1902 | ||
| YE-7 | Cavite NS | Cavite PI | 90 | 1902 | ||
| YE-8 | Cavite NS | Cavite PI | 110 | 1907 | ||
| YE-9 | New York NSY | Brooklyn NY | 100 | 1904 | ||
| YE-10 | Philadelphia NSY | Philadelphia PA | 86 | 1904 | ||
| YE-11 | New York NSY | Brooklyn NY | 122 | 1905 | ||
| YE-12 | New York NSY | Brooklyn NY | 100 | 1907 | ||
| YE-13 | Fore River Shipbuilding | Quincy MA | 128 | 1909 | ||
| YE-14 | Puget Sound NSY | Bremerton WA | 75 | 1909 | ex-YA-18 | |
| YE-15 | Puget Sound NSY | Bremerton WA | 90 | 1910 | ||
| YE-16 | Puget Sound NSY | Bremerton WA | 90 | 1910 | ||
| YE-17 | Boston NSY | Charlestown MA | 80 | 1910 | sold 1935 | |
| YE-18 | New York NSY | Brooklyn NY | 86 | 1901 | ||
| YE-19 | New York NSY | Brooklyn NY | 86 | 1903 | ||
| YE-20 | New York NSY | Brooklyn NY | 86 | 1900 | ||
| YE-21 | New York NSY | Brooklyn NY | 90 | 1901 | ||
| YE-22 | 54 | |||||
| YE-23 | Boston NSY | Charlestown MA | 107 | 1911 | discarded 1934 | |
| YE-24 | ||||||
| YE-25 | Norfolk NSY | Portsmouth VA | 110 | 1913 | ex-YC-208 | |
| YE-26 | Norfolk NSY | Portsmouth VA | 110 | 1917 | ex-YC-135 | |
| YE-27 | Mare Island NSY | Vallejo CA | 80 | 1917 | ex-YC-70 | |
| YE-28 | 108 | 882 | ex-Weehawken, acquired 1918, sold 1931 | |||
| YE-29 | 108 | 1,933 | 1909 | ex-Lawrence M. Sullivan, acquired 1918, sold 1930 | ||
| YE-30 | 112 | 3,190 | 1918 | ex-Hercules, acquired 1918, sold 1923 | ||
| YE-31 | 110 | 1919 | ex-YC-534 | |||
| YE-32 | Chicago Bridge | Chicago IL | 110 | 1921 | ex-YC-484 | |
| YE-33 | Chicago Bridge | Chicago IL | 110 | 1921 | ex-YC-485 | |
| YE-34 | Philadelphia NSY | Philadelphia PA | 110 | 1921 | ex-YC-292 | |
| YE-35 | Seattle Const. | Seattle WA | 110 | 1921 | ex-YC-280 | |
| YE-36 | Leonard Construction | Chicago IL | 110 | 1920 | ex-YC-468 | |
| YE-37 | Leonard Construction | Chicago IL | 110 | 1920 | ex-YC-469 | |
| Torpedo Transportation Barges (YFT) | ||||||
| YFT-1 | Dekom Shipbuilding | Brooklyn NY | 110 | 162 | 1942 | ex-YC-753 |
| YFT-2 | Dravo Corp. | Wilmington DE | 110 | 162 | 1942 | ex-YC-709 |
| YFT-3 | Donovan Contracting | Shelburne VT | 80 | 74 | 1942 | |
| YFT-4 | Donovan Contracting | Shelburne VT | 80 | 74 | 1942 | |
| YFT-5 | Donovan Contracting | Shelburne VT | 80 | 74 | 1942 | |
| YFT-6 | 110 | 138 | 1942 | ex-YF-462, to MARAD 1947 | ||
| Ambulance Boats (YH) | ||||||
| YH-1 | Mare Island NSY | Vallejo CA | 65 | 54 | 1919 | ex-YT-97 |
| YH-2 | Mare Island NSY | Vallejo CA | 65 | 54 | 1919 | ex-YT-100 |
| YH-3 | Mare Island NSY | Vallejo CA | 65 | 54 | 1919 | ex-YT-101 |
| YH-4 | Stephens Bros. | Stockton CA | 41 | 24 | 1939 | ex-Sea Breeze, acquired 1941, sold 1947, still active as Sea Breeze |
| YH-5 | 28 | small boat 1942 | ||||
| House Boats (YHB) | ||||||
| YHB-1 | Staten Island SB | Port Richmond NY | 127 | 600 | 1912 | ex-YTT-1, transferred 1946 |
| YHB-2 | San Francisco CA | 220 | 1,142 | 1910 | ex-Capital City, Port of Stockton, acquired 1941, to MARAD 1947 | |
| YHB-3 | 100 | 120 | 1928 | acquired 1941, to MARAD 1947 | ||
| YHB-4 | 160 | 88 | 1908 | ex-Washington, acquired 1941, to MARAD 1947 | ||
| YHB-5 | Supple | Portland OR | 145 | 400 | 1916 | ex-Kitsap II, City of Bellingham, Quilcene, acquired 1941, sold 1947 |
| YHB-6 | Isherwood | Glasgow, Scotland | 285 | 1927 | ex-Delta King, acquired 1940, YFB-55, sold 1947 | |
| YHB-7 | Isherwood | Glasgow, Scotland | 285 | 1927 | ex-Delta Queen, acquired 1940, YFB-56, sold 1947 | |
| YHB-8 | Seattle Const. & DD | Seattle WA | 189 | 99 | 1912 | ex-Sol Duc, acquired 1941, scrapped 1947 |
| YHB-9 | Mathis Yachts | Camden NJ | 120 | 150 | 1930 | ex-Truant, acquired 1942, to MARAD 1945 |
| YHB-10 | Long Beach SB | Long Beach CA | 193 | 851 | 1920 | ex-Domingo Nazabal, acquired 1942, destroyed 1945 |
| YHB-11 | 219 | 150 | 1912 | ex-Fort Sutter, acquired 1942, to MARAD 1947 | ||
| YHB-12 | Seattle Const. & DD | Seattle WA | 134 | 150 | 1913 | ex-Comanche, acquired 1942, scrapped 1947 |
| YHB-13 | Mathis Yachts | Camden NJ | 127 | 150 | 1928 | ex-Niagara, acquired 1942, to MARAD 1946 |
| YHB-14 | 101 | 150 | 1925 | acquired 1942, to MARAD 1947 | ||
| YHB-15 | Mathis Yachts | Camden NJ | 98 | 165 | 1931 | ex-Minoco, Idyll, acquired 1942, YAG-20 1942, sold 1945 |
| YHB-16 | Mathis Yachts | Camden NJ | 106 | 134 | 1929 | ex-Viator, acquired 1942, to MARAD 1946 |
| YHB-17 | Mathis Yachts | Camden NJ | 101 | 157 | 1930 | ex-Memory, West Wind, Lela, acquired 1942, YAG-21 1942, wrecked 1945 |
| YHB-18 | Stockton CA | 242 | 250 | 1898 | ex-Crockett, acquired 1942, to MARAD 1947 | |
| YHB-19 | Mathis Yachts | Camden NJ | 106 | 150 | 1916 | ex-Leonie, acquired 1943, to MARAD 1947 |
| YHB-20 | J. W. Dickie | Alameda CA | 228 | 150 | 1903 | ex-Cazadero, acquired 1943, destroyed 1948 |
| YHB-21 | Union Iron Works | San Francisco CA | 224 | 150 | 1902 | ex-Tamalpais, acquired 1943, scrapped 1947 |
| YHB-22 | 80 | 75 | 1920 | acquired 1943, to MARAD 1945 | ||
| YHB-23 | Mathis Yachts | Camden NJ | 101 | 103 | 1929 | ex-Dream Girl, Memory, Big Pebble, CGB-23, acquired 1943, sold 1946 |
| YHB-24 | Maryland Steel | Sparrows Point MD | 307 | 2.000 | 1893 | ex-Alabama, City of Victoria, acquired 1943, scrapped 1948 |
| YHB-25 | New York ship | Camden NJ | 274 | 1,400 | 1913 | ex-Alameda, acquired 1944, scrapped 1947 |
| YHB-26 | 151 | 300 | 1909 | ex-Annie Comings, acquired 1944, to MARAD 1947 | ||
| YHB-27 | 110 | 200 | ex-K. T. No. 9, acquired 1944, to MARAD 1947 | |||
| YHB-28 | 110 | 200 | 1923 | ex-Pacific U. 11, acquired 1944, to MARAD 1947 | ||
| YHB-29 | Sun Shipbuilding | Chester PA | 125 | 300 | 1944 | ex-YCF-62 |
| YHB-30 | Sun Shipbuilding | Chester PA | 125 | 300 | 1944 | ex-YCF-63 |
| YHB-31 | Sun Shipbuilding | Chester PA | 125 | 300 | 1944 | ex-YCF-64 |
| YHB-32 | Sun Shipbuilding | Chester PA | 125 | 300 | 1944 | ex-YCF-65 |
| YHB-33 | Sun Shipbuilding | Chester PA | 125 | 300 | 1944 | ex-YCF-72 |
| YHB-34 | 110 | 138 | 1919 | ex-YC-393 | ||
| YHB-35 | 110 | 138 | 1943 | ex-YFN-514 | ||
| YHB-36 | 110 | 170 | 1912 | ex-YFN-674, ex-YC-264 | ||
| Torpedo Trials Craft (YTT) | ||||||
| YTT-1 | Staten Island SB | Port Richmond NY | 127 | 600 | 1912 | later YHB-1 |
| YTT-2 | Boston NSY | Charlestown MA | 134 | 600 | 1916 | sold 1948 |
| YTT-3 | George Lawley | Neponset MA | 134 | 600 | 1918 | later YR-42 1941 |
| YTT-4 | George Lawley | Neponset MA | 134 | 600 | 1918 | sold 1948 |
| YTT-5 | Portsmouth NSY | Kittery ME | 165 | 430 | 1942 | |
| YTT-6 | Portsmouth NSY | Kittery ME | 165 | 430 | 1943 | |
| YTT-7 | Portsmouth NSY | Kittery ME | 165 | 430 | 1943 | |
| YTT-8 | 103 | 100 | 1902 | ex-YCF-1 | ||
| YTT-9 | McDermott | Morgan City LA | 186 | 1,200 | 1991 | Cape Flattery, sold 2000 as research vessel |
| YTT-10 | McDermott | Morgan City LA | 186 | 1,200 | 1991 | Battle Point |
| YTT-11 | McDermott | Morgan City LA | 186 | 1,200 | 1992 | Discovery Bay |
| YTT-12 | McDermott | Morgan City LA | 186 | 1,200 | 1992 | Agate Pass, to NOAA 2000 as Nancy Foster (R-352) |
| Seaplane Barges (YV) | ||||||
| YV-1 | ||||||
| YV-2 | ||||||
| YV-3 | ||||||
| YV-4-19 | ||||||
| YV-20 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | ||
| YV-21 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | ||
| YV-23 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | ||
| YV-24 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | ||
| YV-25 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | ||
| YV-26 | Herreshoff Mfg. | Bristol RI | 58 | 1918 | later YF-131 | |
| YV-27 | 58 | |||||
| YV-28 | 58 | |||||
| YV-29 | 58 | |||||
| YV-30 | 58 | |||||
| YV-31 | Jacob, Robert | City Island NY | 58 | 1918 | later YF-133 | |
| YV-32 | Jacob, Robert | City Island NY | 58 | 1918 | ||
| YV-33 | Jacob, Robert | City Island NY | 58 | 1918 | ||
| YV-34 | Jacob, Robert | City Island NY | 58 | 1918 | later YF-135 | |
| YV-35-47 | 58 | |||||
| YV-48 | Wood, B. F. | City Island NY | 58 | 1918 | ||
| YV-49 | Wood, B. F. | City Island NY | 58 | 1918 | ||
| YV-50 | Wood, B. F. | City Island NY | 58 | 1918 | ||
| YV-51 | Wood, B. F. | City Island NY | 58 | 1918 | ||
| YV-52 | Wood, B. F. | City Island NY | 58 | 1918 | later YF-137 | |
| YV-53 | Wood, B. F. | City Island NY | 58 | 1918 | later YF-138 | |
| YV-54 | 58 | |||||
| YV-55 | 58 | |||||
| YV-56 | Luders Marine | Stamford CT | 58 | 1918 | ||
| YV-57 | Luders Marine | Stamford CT | 58 | 1918 | ||
| YV-58 | Luders Marine | Stamford CT | 58 | 1918 | ||
| YV-59 | Luders Marine | Stamford CT | 58 | 1918 | ||
| YV-60 | Luders Marine | Stamford CT | 58 | 1918 | later YF-139 | |