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NavSource Online: Service Ship Photo Archive

Defiant (YT 804)

Valiant (Z-TECH 4500) Class Harbor Tug:
  • Built by Martinac Shipbuilding Corp, Tacoma, WA (YN 250)
  • Contract awarded, 10 September 2007
  • Laid down, date unknown
  • Launched, 10 July 2010
  • Delivered, 28 September 2010
  • Placed in service as Defiant (YT 804), 22 October 2010
  • Assigned to Naval Region Northwest, active in Puget Sound area, 2010 - 2019
  • Transferred to Commander, Fleet Activities Yokosuka (CFAY), December 2019
  • Current disposition, assigned to CFAY, active at Yokosuka
    Displacement 460 tons (lt) 590 tons (fl)
    Length 82' waterline, 90' overall
    Beam 38' 3"
    Draft 12' 5"
    Depth 16' 5"
    Speed 12.4 kts (trial)
    Officers 2
    Enlisted 4
    Armament two .50 cal machine guns
    two Caterpillar CAT 3512C 1800bhp diesel engines
    two Schottel Model SRP 1012 steering/propulsion Z-Drive units
    two fixed pitch propellers, providing 42 tons (92,500 lb) bollard pull ahead, 45 tons (99,205 lb) astern
    two R.A. Mitchell Co. diesel generator sets with a John Deere 6068SFM75 prime mover, each rated at 130Kw
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    Defiant (YT 804)
    60k Defiant (YT 804) underway near her builder's yard at Tacoma, WA, summer 2010
    Photo via
    431k Defiant (YT 804) underway in Rich Passage, returning to Bremerton, WA after escorting USS John C. Stennis (CVN 74), 25 June 2012.
    Photo taken by "Trappist the Monk" from MV Kaleetan, via Wikimedia Commons, CC BY 3.0
    Robert Hurst
    60k Defiant (YT 804) assisting John C. Stennis (CVN 74) at Bremerton, WA, 08 June 2015. Ron Reeves
    431k Defiant (YT 804) berthed at Naval Magazine Indian River, Washington, 09 August 2015.
    Photo copyright Peter M. Leenhouts
    Peter M. Leenhouts
    138k Three views of Defiant (YT 804) operating off Puget Sound Naval Shipyard, 27 May 2017. Ships in background are Nimitz (CVN 68) and USNS Benevidez (T-AKR 306).
    Photos copyright Ray F. Lonaker, Jr.
    Ray F. Lonaker Jr.
    244k Defiant (YT 804) assisting USNS Fisher (T-AKR 301) shift berths at Puget Sound Naval Shipyard, 24 June 2017.
    Photo copyright Ray F. Lonaker, Jr.
    Ray F. Longaker Jr.
    1018k Christmas came early to Commander, Fleet Activities Yokosuka (CFAY) with the delivery of Defiant (YT 804), a Valiant-class harbor tug, 09 December 2019. Military Sealift Command’s MV Ocean Jazz, a Heavy Lift Vessel, spent nearly two hours lifting and dropping the harbor tug in water near CFAY’s Berth 6.
    US Navy photo 191209-N-JT445-1096 by Ryo Isobe
    Dave Wright

    There is no DANFS history for Defiant (YT 804) available at NavSource
    Additional Resources and Web Sites of Interest
    National Association of Fleet Tug Sailors
    "New Navy tugs have the finesse, power for a wide range of duties", by Brian Gauvin Professional Mariner, July 2, 2012

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    This page was created by Gary P. Priolo and is maintained by David L. Wright
    All pages copyright NavSource Naval History
    Last Updated 25 July 2022