Question: The GBU-28 is a 5,000-pound laser-guided "bunker busting" bomb produced originally by an arsenal on the west bank of the Hudson River that has been what since 1966?

Context paragraphs:
Federal Dam (Troy): The Federal Dam is a manmade dam built across the Hudson River in the U.S. state of New York from Troy on the east bank to Green Island on the west bank.  The major function of the dam is to improve navigability.  It is located at mile 153 of the Hudson River, measuring from the beginning of the Hudson as a Federally Navigable Waterway near the Battery in Manhattan.  The location of the dam marks the northern end of the Hudson River estuary.

Watervliet Arsenal: The Watervliet Arsenal is an arsenal of the United States Army located in Watervliet, New York, on the west bank of the Hudson River.  It is the oldest continuously active arsenal in the United States, and today produces much of the artillery for the army, as well as gun tubes for cannons, mortars, and tanks.  It has been a National Historic Landmark since 1966.

SCALPEL: SCALPEL (Small Contained-Area Laser Precision Energetic Load) is a laser-guided bomb produced by Lockheed Martin.  The weapon is being developed from the Enhanced Laser Guided Training Round (E-LGTR) which is the training version of the Paveway II series of bombs.  The rationale behind the system is to provide a light, low-collateral damage weapon which can utilise the infrastructure and platform integration already in place for the E-LGTR system.  On 14 March 2010, the US Navy announced its intention to purchase Scalpel.  The Navy completed some integration work in 2011 and the weapon was still self-funded as of 2016, but Scalpel could be ready for operations in “a year or two” depending if a launch customer commits extra funding and test range support.  The Scalpel Plus version has a dual-mode SAL/GPS guidance system.

Storm King Mountain (New York): Storm King Mountain is along the west bank of the Hudson River south of Cornwall-on-Hudson, New York.  Together with Breakneck Ridge on the opposite bank of the river it forms "Wey-Gat" or Wind Gate, the picturesque northern gateway to the Hudson Highlands.  Its distinctive curved ridge is the most prominent aspect of the view south down Newburgh Bay, from Newburgh, Beacon, and the Newburgh-Beacon Bridge.  It can also be seen by southbound travelers on nearby sections of the New York State Thruway.  This view was popular with early artists of the Hudson River School, and helped give them their name.

9K720 Iskander: The 9K720 Iskander (Russian: «Искандер» ; NATO reporting name SS-26 Stone) is a mobile short-range ballistic missile system produced and deployed by the Russian Federation.  The missile systems ("Искандер-М") are to replace the obsolete OTR-21 "Tochka" systems, still in use by the Russian armed forces, by 2020.  The Iskander has several different conventional warheads, including a cluster munitions warhead, a fuel-air explosive enhanced-blast warhead, a high explosive-fragmentation warhead, an earth penetrator for bunker busting and an electromagnetic pulse device for anti-radar missions.  The missile can also carry nuclear warheads.  In September 2017, the KBM general designer Valery M. Kashin said that there were at least seven types of missiles (and ″perhaps more″) for Iskander, including one cruise missile.

Crow's Nest (New York): Crow's Nest is a mountain along the west bank of the Hudson River in the Town of Highlands on the northern edge of the United States Military Academy (USMA) at West Point.  US 9W passes just west of its summit and offers panoramic views of the Hudson River, the military academy's ski slope, and Constitution Island.

GBU-37 GPS-Aided Munition: The GBU-37 (Guided Bomb Unit-37) Global Positioning System Aided Munition (GAM) was developed for use with the B-2 Bomber.  The bomb can penetrate hardened targets or targets buried deep underground.  The first all-weather precision-guided bunker buster, it became operational in 1997.  It has been replaced on the B-2 by the 5000-pound GPS-aided/INS-guided GBU-28.

GBU-28: The GBU-28 is a 5,000-pound (2,268 kg) laser-guided "bunker busting" bomb produced originally by the Watervliet Arsenal, Watervliet, New York.  It was designed, manufactured, and deployed in less than three weeks due to an urgent need during Operation Desert Storm to penetrate hardened Iraqi command centers located deep underground.  Only two of the weapons were dropped in Desert Storm, both by F-111Fs.  One GBU-28 was dropped during Operation Iraqi Freedom.

Weehawken Cove: Weehawken Cove is a cove on the west bank of the Hudson River between the New Jersey municipalities of Hoboken to the south and Weehawken to the north.  At the perimeter of the cove are completed sections the Hudson River Waterfront Walkway, offering views of Manhattan and the Palisades.  The name Weehawken comes from the Lenape, and can translate as ""at the end of"", either the Hudson Palisades or the stream which flowed from them into the cove, later the site of the nearby Lincoln Tunnel.

Saw Kill: Saw Kill may refer to three different bodies of water in New York.  Two are tributaries and make up watersheds on the eastern bank of the Hudson River.  The northernmost of these is in the Town of Stuyvesant, New York in Columbia County and the southernmost of these is in the Town of Red Hook, New York in Dutchess County.  The northern Saw Kill is more commonly known as Mill Creek today.  The third tributary drains into Esopus Creek on the Hudson’s west bank.  This article refers to the southern body of water on the east bank as Saw Kill (east) and the body of water on the west bank as Saw Kill (west).

Supporting paragraphs: GBU-28 Watervliet Arsenal
Answer: National Historic Landmark