NavSource Photo Archives:

Minesweeper (AM)
Minesweeper, Steel hulled (MSF)
Minesweeper, Ocean (MSO)
Index


As a result of the Korean war experience the United States undertook the construction of a new series of minesweepers on a large scale. During the decade of the 1950s sixty-five new minesweepers were built. These new minesweepers were designated Minesweeper, Ocean (MSO). They consisted of three classes of ships: Agile/Aggressive, Hull numbers 421 to 507; Acme, hull numbers 508 to 518; and Ability, hull numbers 519 to 522. In contrast to the steel-hulled minesweepers of World War II, designated AM later MSF and still later, MSO. These new minesweepers were smaller and built primarily of wood , with bronze and stainless (non-magnetic) steel fittings to minimize their magnetic signature. All of the 1950 era MSOs had UQS-1 mine-locating sonar, later updated with SQQ-14 sonar. MSOs were capable of sweeping for moored, bottom contact, magnetic and acoustic mines.
Click on ship name to view image(s) and DANFS history.

Minesweeper Photo Index
AM-1 Lapwing Reclassified AVP-1
AM-2 Owl Reclassified AT-137
AM-3 Robin Reclassified AT-140
AM-4 Swallow
AM-5 Tanager
AM-6 Cardinal
AM-7 Oriole Reclassified AT-136
AM-8 Curlew
AM-9 Finch
AM-10 Heron Reclassified AVP-2
AM-11 Condor
AM-12 Plover
Construction canceled 23 November 1918
AM-13 Turkey Reclassified AT-143
AM-14 Woodcock Reclassified AT-145
AM-15 Quail
AM-16 Partridge Reclassified AT-138
AM-17 Eider Reclassified YNG-20
AM-18 Thrush Reclassified AVP-3
AM-19 Avocet Reclassified AVP-4
AM-20 Bobolink Reclassified AT-131
AM-21 Lark Reclassified AT-168
AM-22 Widgeon Reclassified ASR-1
AM-23 Teal Reclassified AVP-5
AM-24 Brant Reclassified AT-132
AM-25 Kingfisher Reclassified AT-135
AM-26 Rail Reclassified AT-139
AM-27 Pelican Reclassified AVP-6
AM-28 Falcon Reclassified ASR-2
AM-29 Osprey Renamed/Reclassified Crusader (ARS-2)
AM-30 Seagull Reclassified AT-141
AM-31 Tern Reclassified AT-142
AM-32 Flamingo Reclassified ARS-1
AM-33 Penguin
AM-34 Swan Reclassified AVP-7
AM-35 Whippoorwill Reclassified AT-169
AM-36 Bittern
AM-37 Sanderling
AM-38 Auk Renamed/Reclassified Discoverer (ARS-3)
AM-39 Chewink Reclassified ASR-3
AM-40 Cormorant Reclassified AT-133
AM-41 Gannet Reclassified AVP-8
AM-42 Goshawk Construction canceled 4 December 1918
AM-43 Grebe Reclassified AT-134
AM-44 Mallard Reclassified ASR-4
AM-45 Ortolan Reclassified ASR-5
AM-46 Peacock
AM-47 Pigeon Reclassified ASR-6
AM-48 Redwing Reclassified ARS-4
AM-49 Raven
AM-50 Shrike
Construction canceled 4 December 1918
AM-51 Sandpiper Reclassified AVP-9
AM-52 Vireo Reclassified AT-144
AM-53 Warbler Reclassified ARS-11
AM-54 Willet Reclassified ARS-12
AM / MSF-55 Raven
AM-56 Osprey
AM / MSF-57 Auk
AM / MSF-58 Broadbill
AM / MSF-59 Chickadee
AM / MSF-60 Nuthatch
AM / MSF-61 Pheasant
AM-62 Sheldrake Reclassified AGS-19
AM-63 Skylark
AM / MSF-64 Starling
AM-65 Swallow
AM-66 Bullfinch
AM-67 Cardinal
AM-68 Catbird Reclassified IX-183
AM-69 Curlew Reclassified IX-170
AM-70 Flicker Reclassified IX-165
AM-71 Albatross Reclassified IX-171
AM-72 Bluebird Reclassified IX-172
AM-73 Grackle
AM-74 Gull
AM-75 Kite
AM-76 Linnet Reclassified as IX-166
AM-77 Goldfinch
AM-78 Goldcrest Reclassified/Renamed Agate (PYc-4)
AM-79 Goshawk ex AMc-4 Reclassified IX-195
AM-80 Goldcrest
AM-81 Chaffinch
AM-82 Adroit Reclassified PC-1586
AM-83 Advent Reclassified PC-1587
AM-84 Annoy Reclassified PC-1588
AM-85 Conflict Reclassified PC-1589
AM-86 Constant Reclassified PC-1590
AM-87 Daring Reclassified PC-1591
AM-88 Dash Reclassified PC-1592
AM-89 Despite Reclassified PC-1593
AM-90 Direct Reclassified PC-1594
AM-91 Dynamic Reclassified PC-1595
AM-92 Effective Reclassified PC-1596
AM-93 Engage Reclassified PC-1597
AM-94 Excel Reclassified PC-1598
AM-95 Exploit Reclassified PC-1599
AM-96 Fidelity Reclassified PC-1600
AM-97 Fierce Reclassified PC-1601
AM-98 Firm Reclassified PC-1602
AM-99 Force Reclassified PC-1603
AM / MSF-100 Heed
AM / MSF-101 Herald
AM / MSF-102 Motive
AM / MSF-103 Oracle
AM / MSF-104 Pilot
AM / MSF-105 Pioneer
AM-106 Portent
AM-107 Prevail Reclassified AGS-20
AM-108 Pursuit Reclassified AGS-17
AM-109 Requisite Reclassified AGS-18
AM / MSF-110 Revenge
AM / MSF-111 Sage
AM / MSF-112 Seer Reclassified MMC-5
AM-113 Sentinel
AM / MSF-114 Staff
AM-115 Skill
AM / MSF-116 Speed
AM / MSF-117 Strive Reclassified MMC-1
AM / MSF-118 Steady
AM / MSF-119 Sustain
AM / MSF-120 Sway
AM-121 Swerve
AM-122 Swift
AM-123 Symbol
AM-124 Threat
AM-125 Tide
AM / MSF-126 Token
AM / MSF-127 Tumult
AM / MSF-128 Velocity
AM-129 Vital to Great Britian as HMS Strenuous (J 338)
AM-130 Usage to Great Britian as HMS Tourmaline (J 339)
AM / MSF-131 Zeal
AM-132 Eagle Reclassified/Renamed Captor (PYc-40)
AM-133 Hawk
AM-134 Ibis
AM-135 Merganser
AM / MSF-136 Admirable ex-AMc-113
AM / MSF-137 Adopt ex-AMc-114
AM-138 Advocate ex-AMc-115 to USSR as T-111
AM-139 Agent ex-AMc-116 to USSR as T-112
AM-140 Alarm ex-AMc-117 to USSR as T-113
AM-141 Alchemy ex-AMc-118 to USSR as T-114
AM-142 Apex ex-AMc-119 to USSR as T-115
AM-143 Arcade ex-AMc-120 to USSR as T-116
AM-144 Arch ex-AMc-121 to USSR as T-117
AM-145 Armada ex-AMc-122 to USSR as T-118
AM-146 Aspire ex-AMc-123 to USSR as T-119
AM-147 Assail ex-AMc-124 to USSR as T-120
AM / MSF-148 Astute ex-AMc-125
AM / MSF-149 Augury ex-AMc-126
AM / MSF-150 Barrier ex-AMc-127
AM / MSF-151 Bombard ex-AMc-128
AM / MSF-152 Bond ex-AMc-129
AM / MSF-153 Buoyant ex-AMc-130
AM / MSF-154 Candid ex-AMc-131
AM / MSF-155 Capable ex-AMc-132
AM / MSF-156 Captivate ex-AMc-133
AM / MSF-157 Caravan ex-AMc-134
AM / MSF-158 Caution ex-AMc-135
AM / MSF-159 Change ex-AMc-136
AM / MSF-160 Clamour ex-AMc-137
AM / MSF-161 Climax ex-AMc-138
AM / MSF-162 Compel ex-AMc-139
AM / MSF-163 Concise ex-AMc-140
AM / MSF-164 Control ex-AMc-141
AM / MSF-165 Counsel ex-AMc-142
AM-166 to AM-208 Construction canceled 9 April 1942
AM-209 to AM-213 Construction canceled 10 April 1942
AM / MSF-214 Crag
AM / MSF-215 Cruise
AM / MSF-216 Deft
AM-217 Delegate
AM / MSF-218 Density
AM / MSF-219 Design
AM / MSF-220 Device
AM / MSF-221 Diploma
AM / MSF-222 Disdain
AM / MSF-223 Dour
AM / MSF-224 Eager
AM-225 Elusive
AM-226 Embattle
AM-227 Embroil
AM-228 Enhance
AM-229 Equity
AM-230 Esteem
AM-230 Esteem
AM-231 Event
Construction canceled 6 June 1944
AM / MSF-232 Execute ex-PCE-905
AM / MSF-233 Facility ex-PCE-906
AM / MSF-234 Fancy
AM-235 Fixity ex-PCE-908
AM-236 Flame ex-PCE-909
AM-237 Fortify ex-PCE-910
Canceled 6 June 1944
AM / MSF-238 Garland
AM / MSF-239 Gayety
AM / MSF-240 Hazard
AM / MSF-241 Hilarity
AM / MSF-242 Inaugural
AM-243 Illusive
AM-244 Imbue
AM-245 Impervious
Canceled 6 June 1944
AM-246 Implicit
AM-247 Improve
AM-248 Incessant
AM / MSF-249 Incredible
AM-250 Indicative
AM-251 Inflict
AM / MSF-252 Instill
AM / MSF-253 Intrigue
AM / MSF-254 Invade
AM / MSF-255 Jubilant
AM / MSF-256 Knave
AM-257 Lance
AM-258 Logic
AM-259 Lucid
AM-260 Magnet
AM / MSF-261 Mainstay
AM / MSF-262 Marvel
AM-263 Measure
AM / MSF-264 Method
AM / MSF-265 Mirth
AM-266 Nimble
AM-267 Notable
AM / MSF-268 Nucleus
AM / MSF-269 Opponent
AM-270 Palisade
AM / MSF-271 Penetrate
AM-272 Peril
AM-273 Phantom
AM-274 Pinnacle
AM-275 Pirate
AM-276 Pivot
AM-277 Pledge
AM-278 Project
AM-279 Prime
AM / MSF-280 Prowess Reclassified IX-305
AM-281 Quest
AM / MSF-282 Rampart
AM-283 Ransom
AM / MSF-284 Rebel
AM / MSF-285 Recruit
AM-286 Reform
AM-287 Refresh
AM / MSF-288 Reign Never commissioned
AM / MSF-289 Report to South Korea as Kojin (PCE-50)
AM-290 Reproof
AM-291 Risk
Canceled 1 November 1945
AM-292 Rival
AM-293 Sagacity
Canceled 6 June 1944
AM / MSF-294 Salute
AM-295 Saunter
AM-296 Scout
AM / MSF-297 Scrimmage
AM / MSF-298 Scuffle
AM / MSF-299 Sentry
AM / MSF-300 Serene
AM / MSF-301 Shelter
AM / MSF-302 Signet
AM / MSF-303 Skirmish
AM / MSF-304 Scurry
AM-305 Spectacle
AM / MSF-306 Specter
AM / MSF-307 Staunch
AM / MSF-308 Strategy
AM / MSF-309 Strength
AM / MSF-310 Success
AM / MSF-311 Superior
AM-312 & AM-313
Construction canceled 7 May 1942
AM / MSF-314 Champion
AM / MSF-315 Chief
AM / MSF-316 Competent
AM / MSF-317 Defense
AM / MSF-318 Devastator
AM / MSF-319 Gladiator
AM / MSF-320 Impeccable
AM / MSF-321 Overseer
AM / MSF-322 Spear
AM / MSF-323 Triumph Reclassified MMC-3
AM / MSF-324 Vigilance
AM-325 to Great Britian as HMS Antares (J 282)
AM-326 to Great Britian as HMS Arcturus (J 283)
AM-327 to Great Britian as HMS Aries (J 284)
AM-328 to Great Britian as HMS Clinton (J 286)
AM-329 to Great Britian as HMS Friendship (J 398)
AM-330 to Great Britian as HMS Gozo (J 287)
AM-331 to Great Britian as HMS Lightfoot (J 288)
AM-332 to Great Britian as HMS Melita (J 289)
AM-333 to Great Britian as HMS Octavia (J 290)
AM-334 to Great Britian as HMS Persian (J 347)
AM-335 to Great Britian as HMS Postillion (J 296)
AM-336 to Great Britian as HMS Skipjack (J 300)
AM-337 to Great Britian as HMS Thisbe (J 302)
AM-338 to Great Britian as HMS True Love (J 303)
AM-339 to Great Britian as HMS Welfare (J 356)
AM / MSF-340 Ardent
AM / MSF-341 Dextrous
AM-342 to AM-350 Hull numbers not used
AM-351 Adjutant ex-PCE-911
AM-352 Bittern ex-PCE-912
AM-353 Breakhorn ex-PCE-913
AM-354 Cariama ex-PCE-914
AM-355 Chukor ex-PCE-915
Construction canceled 1 November 1945
AM / MSF-356 Creddock
AM / MSF-357 Dipper
AM-358 Dotterel ex-PCE-918
Construction canceled 1 November 1945
AM-359 Drake ex-PCE-919 Renamed/Reclassified Ampere (ADG 11)
AM-360 Driver ex-PCE-920
Construction canceled 1 November 1945
AM-361 Dunlin
AM / MSF-362 Gadwall
AM-363 Gavia ex-PCE-907
AM / MSF-364 Graylag
AM / MSF-365 Harlequin
AM-366 Harrier
AM-367 Hummer
AM-368 Jackdaw
AM-369 Medrick
AM-370 Minah
Construction canceled 6 June 1944
AM-371 Minivet
AM / MSF-372 Murrelet
AM / MSF / EMSF-373 Peregrine Reclassified AG-176
AM / MSF-374 Pigeon
AM / MSF-375 Pochard
AM / MSF-376 Ptarmigan
AM / MSF-377 Quail
AM / MSF-378 Redstart
AM / MSF-379 Roselle
AM / MSF-380 Ruddy
AM / MSF-381 Scoter
AM / MSF-382 Shoveler
AM / MSF-383 Surfbird Reclassified ADG-383
AM / MSF-384 Sprig
AM / MSF-385 Tanager
AM / MSF-386 Tercel
AM / MSF-387 Toucan
AM / MSF-388 Towhee Reclassified AGS-28
AM / MSF-389 Waxwing
AM / MSF-390 Wheatear
AM-391 Albatross
AM-392 Bullfinch
AM-393 Cardinal
AM-394 Firecrest
Construction canceled 1 November 1945
AM-395 Goldfinch
AM-396 Grackle
AM-397 Grosbeak
AM-398 Grouse
AM-399 Gull
AM-400 Hawk
AM-401 Hummer
AM-402 Jackdaw
AM 403 Kite
AM-404 Longspur
AM-405 Merganser
AM-406 Osprey
AM-407 Partridge
AM-408 Plover
AM-409 Redhead
AM-410 Sanderling
AM-411 Scaup
AM-412 Sentinel
AM-413 Shearwater
AM-414 Waxbill
AM-415 Bluebird
AM-416 Flicker
AM-417 Linnet
AM-418 Magpie
AM-419 Parrakeet
AM-420 Pipit
Construction canceled 11 August 1945
AM / MSO-421 Agile
AM / MSO-422 Aggressive
AM / MSO-423 Avenge
AM / MSO-424 Bold
AM / MSO-425 Bulwark
AM / MSO-426 Conflict
AM / MSO-427 Constant
AM / MSO-428 Dash
AM / MSO-429 Detector
AM / MSO-430 Direct
AM / MSO-431 Dominant
AM / MSO-432 Dynamic
AM / MSO-433 Engage
AM / MSO-434 Embattle
AM / MSO-435 Endurance
AM / MSO-436 Energy
AM / MSO-437 Enhance
AM / MSO-438 Esteem
AM / MSO-439 Excel
AM / MSO-440 Exploit
AM / MSO-441 Exultant
AM / MSO-442 Fearless
AM / MSO-443 Fidelity
AM / MSO-444 Firm
AM / MSO-445 Force
AM / MSO-446 Fortify
AM / MSO-447 Guide
AM / MSO-448 Illusive
AM / MSO-449 Impervious
AM / MSO-450 to France as Berneval (M 613)
AM / MSO-451 to France as Bir Hacheim (M 614) then to Uruguay as Maldonado (MS 33)
AM / MSO-452 to France as Garigliano (M 617)
AM / MSO-453 to France as Alencon (M 612)
AM / MSO-454 to France as Dompaire (M 616)
AM / MSO-455 Implicit
AM / MSO-456 Inflict
AM / MSO-457 Loyalty
AM / MSO-458 Lucid
AM / MSO-459 Nimble
AM / MSO-460 Notable
AM / MSO-461 Observer
AM / MSO-462 Pinnacle
AM / MSO-463 Pivot
AM / MSO-464 Pluck
AM / MSO-465 Prestige
AM / MSO-466 Prime
AM / MSO-467 Reaper
AM / MSO-468 Rival
AM / MSO-469 Sagacity
AM / MSO-470 Salute
AM / MSO-471 Skill
AM / MSO-472 Valor
AM / MSO-473 Vigor
AM / MSO-474 Vital
AM / MSO-475 to France as Mythos (M 618)
AM / MSO-476 to France as Cantho (M 615)
AM / MSO-477 to France as Vinh Long (M 619)
AM / MSO-478 to Portugal as Sao Jorge (M 415)
AM / MSO-479 to Portugal as Pico (M 416)
AM / MSO-480 to the Netherlands as Onversaagd (M 884)
AM / MSO-481 to the Netherlands as Onbevreesd (M 885)
AM / MSO-482 to the Netherlands as Onvervaard (M 888)
AM / MSO-483 to the Netherlands as Onverschrokken (M 886)
AM / MSO-484 to the Netherlands as Onvermoeid (M 887)
AM / MSO-485 to the Netherlands as Onverdroten (M 889)
AM / MSO-486 to Portugal as Graciosa (M 417)
AM / MSO-487 to Portugal as Corvo (M 418)
AM / MSO-488 Conquest
AM / MSO-489 Gallant
AM / MSO-490 Leader
AM / MSO-491 Persistent
AM / MSO-492 Pledge
AM / MSO-493 Stalwart
AM / MSO-494 Sturdy
AM / MSO-495 Swerve
AM / MSO-496 Venture
AM-497 Never built or awarded
AM / MSO-498 to Norway as Lagen (M 950), then to Belgium as Dufour (M 903)
AM / MSO-499 to Norway as Namsen (M 951), then to Belgium as De Brower (M 904)
AM / MSO-500 to for France as Berlaimont (M 620)
AM / MSO-501 to France as Origny (M 621)
AM / MSO-502 to France as Autun (M 622)
AM / MSO-503 to Belgium as Artevelde (M 907)
AM / MSO-504 to Belgium as Breydel (M 906)
AM / MSO-505 to France as Baccarat (M 623)
AM / MSO-506 to Italy as Storione (M 5431)
AM / MSO-507 to Italy as Salmone (M 5430)
AM / MSO-508 Acme
AM / MSO-509 Adroit
AM / MSO-510 Advance
AM / MSO-511 Affray
AM / MSO-512 to France as Narvik (M 609)
AM / MSO-513 to France as Ouistreham (M 610)
AM / MSO-514 to France as Colmar (M 624)
AM / MSO-515 to Belgium as G. Truffaut (M 908)
AM / MSO-516 to Belgium as F. Bovesse (M 909)
AM / MSO-517 to Italy as Sgombro (M 5432)
AM / MSO-518 to Italy as Squalo (M 5433)
AM / MSO-519 Ability
AM / MSO-520 Alacrity Reclassified AG-520
AM / MSO-521 Assurance Reclassified AG-521
AM / MSO-522 to Belgium as J. E. Van Haverbeke (M 902)
MSO-523 to MSO-538 canceled 1968

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