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Fleet Ocean Tugs (ATF)
Originally Ocean-Going Tugs (AT)
1922-1945
AT-64 (Navajo) class (AT 64-76, 81-95)
AT-96 (Abnaki) class (AT 96-98, 100-118)
AT-148 (Achowami) class (AT 148-163)
Note: The AT-96 and AT-148 classes are variants of the AT-64 class.
Other AT/ATF Hull Numbers, 1920-1945
AT-99, 164-165: see ASR-12, 19-20