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NavSource Online: Service Ship Photo Archive

SS Green Mountain State (ACS-9)

Keystone State Class Crane Ship):

Laid down, 2 December 1963, as the breakbulk ship, SS Mormacaltair, a Maritime Administration type (C6-S-60a) hull, under Maritime Administration contract (MA 143) at Ingalls Shipbuilding Inc., Pascagoula, MS.

Launched, 20 August 1964

Delivered to the Moore-McCormack Lines, 26 March 1965

Renamed SS American Altair, date unknown

Reacquired by the Maritime Administration (MARAD) in 1987

Converted to a MARAD type hull (C6-S-MA60d) Crane Ship at National Steel and Shipbuilding Co., San Diego, CA.

Assigned by the Maritime Administration to the Ready Reserve Force, (RRF), under operation control of the Military Sealift Command (MSC)

Placed in service as SS Green Mountain State (ACS-9), 15 March 1992

Green Mountain State was berthed at Bremerton, WA. and assigned to Maritime Prepositioning Ship Squadron Three and was maintained in a five-day readiness status

Removed from MSC control, withdrawn from the RRF by reassignment to the National Defense Reserve Fleet, 28 July 2006

Specifications:
Displacement 11,714 t.(lt) 31,500 t.(fl)
Length 668' 6"
Beam 76' 1"
Draft 33' 5"
Speed 20.4 kts.
Cargo Capacity 300+ standard containers
Complement Reserve operational status 10 civilian mariners
Armament none
Propulsion

two General Electric turbines

two boilers

single propeller, 19,250shp

Click On Image For Full Size Image	Size	Image Description	Source
Commercial Service
	73k	Moore-McCormack Lines SS Mormacaltair underway in the Panama Canal in 1970.	Richard Miller BMCS USNR Ret.
	124k	Moore-McCormack Lines SS Mormacaltair underway, date and location unknown.
SS Green Mountain State (ACS-9) MARAD RRF
	56k	*SS Green Mountain State* (T-ACS-9) moored pierside in a shipyard, date and place unknown. Note APL-44 moored to starboard of Green Mountain State**. US Maritime Administration photo.	MARAD web site
	75k	*SS Green Mountain State* (ACS-9)** underway, date and location unknown. US Navy photo.	MSC web site
	1349k	*SS Green Mountain State* (ACS-9)** laid up in reserve in the National Defense Reserve Fleet, Suisun Bay Group, Benecia, CA., 24 July 2011. Photo by Christopher Thomas Mason.	Robert Hurst
0913505804	107k	*SS Cape Borda* (AK-5058) and SS Cape Breton (AK-5056 and SS Green Mountain State (ACS-9)** and others laid up in the Suisun Bay Reserve Fleet, Benecia, CA., 24 July 2011. Photo courtesy of Earthpig. licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license	Robert Hurst

There is no DANFS history available for Green Mountain State (T-ACS-9) at NavSource

Additional Resources and Web Sites of Interest
MARAD Vessel History Database

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This page is created and maintained by Gary P. Priolo

Last Updated 21 November 2025