The vessel is USNS WILLIAM McLEAN. As you may have guessed the USNS means United States Navy Ship, just similar to the British Royal Navy ships being HMS.
From Wikipedia her description is
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USNS Wiliam McLean (T-AKE-12) underway in 2013 USNS William McLean (T-AKE 12) in October 2013 History
Name William McLean Namesake William McLean[1] Awarded 12 December 2008[2] Builder National Steel and Shipbuilding[2] Laid down 23 March 2010[2] Launched 16 April 2011[3] Sponsored by Margaret Taylor[3] In service 28 September 2011 Homeport Naval Weapons Station Earle, Colts Neck, NJ Identification IMO number: 9552006 MMSI number: 367852000 Callsign: NWMC Motto Si Vis Pacem • Para Bellum Status In service U.S. Atlantic Fleet Badge General characteristics Class and type Lewis and Clark-class cargo ship Displacement 23,852 tons light, 40,298 tons full, 16,446 tons dead[2] Length 210 m (689 ft) overall, 199.3 m (654 ft) waterline[2] Beam 32.3 m (106 ft) extreme, 32.3 m (106 ft) waterline[2] Draft 9.1 m (30 ft) maximum, 9.4 m (31 ft) limit[2] Propulsion Integrated propulsion and ship service electrical system, with generation at 6.6 kV by FM/MAN B&W diesel generators; one fixed pitch propeller; bow thruster[2] Speed 20 knots (37 km/h) Range 14,000 nautical miles at 20 kt (26,000 km at 37 km/h) Capacity Max dry cargo weight: 5,910 long tons (6,005 t) Max dry cargo volume: 783,000 cubic feet (22,000 m³) Max cargo fuel weight: 2,350 long tons (2,390 t) Cargo fuel volume: 18,000 barrels (2,900 m³) (DFM: 10,500) (JP5:7,500) Complement 0 military, 130 civilian[2] Electronic warfare & decoys Nulka decoy launchers (space allocated but not installed) Armament 2–6 × 0.5 in (12.7 mm) machine guns or 7.62 mm medium machine guns Aircraft carried two helicopters, either Sikorsky MH-60S Knighthawk or Aerospatiale P
 


WILLIAM McLEAN is now shaping for the entrance to Loch Long. Waiting ahead are the Admiralty Pilot boat DMS POPPY and the Clydeport Pilot cutter GANTOCK.
GANTOCK will take off the Clydeport Pilot who has brought McLEAN from the Cumbraes to the change-over point and DMS POPPY will board an Admiralty Pilot onto McLEAN and he will take her through Loch Long and berth her at Glenmallan.
Also ahead, waiting patiently near Baron's Point are the Serco tugs SD IMPETUS, SD RESOURCEFUL and SD RELIABLE who will take McLEAN through the narrow Loch and berth her at Glenmallan Jetty.
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