U.S. Army Commits $862.8M to M1156 Kits That Transform 155mm Shells Into Precision Weapons.

The U.S. Army has awarded Northrop Grumman a contract worth up to $862.8 million to expand production of M1156 Precision Guidance Kits, according to a September 3, 2026, U.S. Department of War announcement. The kits give existing 155mm artillery forces greater accuracy without requiring entirely new ammunition stocks or firing systems, strengthening precision-fire capacity for high-intensity combat.

The five-year contract covers M1156 kits and associated variants that convert conventional 155mm artillery projectiles into precision-guided rounds. This approach allows the Army to increase the effectiveness of its existing artillery inventory while preserving ammunition depth, logistics compatibility, and sustained firepower during prolonged operations.

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The U.S. Army awarded Northrop Grumman an $862.8 million contract to expand production of M1156 Precision Guidance Kits that convert conventional 155mm artillery shells into precision-guided weapons (Picture Source: U.S. Army)

On September 3, 2026, the U.S. Army awarded Northrop Grumman Systems Corp. a contract valued at up to $862.8 million for M1156 Precision Guidance Kits and associated variants, reinforcing a capability designed to turn conventional 155mm artillery ammunition into precision weapons. The award gives the Army a long-term procurement vehicle for expanding guided artillery capacity while retaining the vast stocks, guns and logistics infrastructure already built around standard 155mm ammunition. The contract was announced by the U.S. Department of War as Washington continues to place greater emphasis on precision fires, ammunition depth and resilience in high-intensity warfare.

Northrop Grumman received an $862,848,000 firm-fixed-price, indefinite-delivery/indefinite-quantity contract covering the manufacture, inspection, testing, packaging and delivery of M1156 Precision Guidance Kits and variants. The Army said bids were solicited through the internet and one was received. Work locations, funding levels and production volumes will be determined through individual orders, with the overall contract running through an estimated completion date of September 3, 2031. Army Contracting Command in Newark, New Jersey, is the contracting activity under contract W15QKN-26-D-A072. Importantly, the announced value represents the contract ceiling rather than confirmation that $862.8 million has already been obligated or that a specific quantity of kits has been ordered.

At the center of the program is the M1156 PGK, formerly designated XM1156, an Army precision-guidance system created to convert existing 155mm artillery projectiles into what are effectively smart weapons. Installed in place of a conventional artillery fuze, PGK combines fuzing functions with a GPS receiver, guidance electronics and flight-control capability that allow the projectile to correct errors in its ballistic trajectory after leaving the gun. The system is designed for existing M795 and M549A1 high-explosive projectiles and can be employed from major U.S. artillery platforms including the M109A6 and M109A7 Paladin self-propelled howitzers and the M777A2 lightweight towed howitzer. This architecture is central to PGK's value: precision can be added to ammunition already in inventory without requiring the Army to replace every conventional shell with a purpose-built guided projectile.

That places the M1156 in an important operational space between traditional unguided artillery and more sophisticated dedicated precision-guided munitions. Instead of simply accepting the dispersion inherent in conventional ballistic fires, PGK corrects part of the accumulated error during flight and substantially improves the probability that a standard projectile will land close to its assigned coordinates. Army requirements have historically identified a threshold accuracy of less than 50 meters circular error probable and an objective below 30 meters, while retaining point-detonation and height-of-burst functions. The result is not intended to make every conventional shell equivalent to the most advanced precision munition; it gives artillery units a scalable way to dramatically improve the effectiveness of ordinary high-explosive rounds across a much larger ammunition inventory.

The strategic importance extends well beyond accuracy. In a prolonged artillery campaign, the ability to achieve the required battlefield effect with fewer rounds can translate into lower ammunition consumption, fewer resupply movements, reduced handling requirements and more efficient use of transport and storage capacity. Earlier Army assessments linked PGK's improved accuracy to potentially significant reductions in the logistics burden associated with projectiles and propellant charges. That matters in a conflict where ammunition expenditure could reach industrial scale and supply routes may be under persistent surveillance or attack. A larger inventory of PGK-equipped rounds could give commanders another option between firing large salvos of unguided ammunition and consuming smaller stocks of expensive specialized precision weapons, allowing precision effects to be spread more broadly across the artillery force.

Precision based on satellite navigation, however, is increasingly being measured against an electronic-warfare threat rather than an uncontested GPS environment. The Army's M1156A1 incorporates an M-code-capable GPS receiver intended to improve resilience against emerging threats; Army officials reported that the configuration achieved full materiel release in 2025. Development is also moving toward the M1156E5, which Army portfolio documentation describes as adding enhanced GPS anti-jam capability for operations in degraded navigation environments. Northrop Grumman similarly presents its PGK E5 as a next-generation configuration designed to preserve artillery accuracy when GPS is contested. The September 2026 contract specifically covers “M1156 precision guidance kits and variants,” but the government notice does not disclose the quantities or configuration mix to be purchased, so it should not be interpreted as confirmation that all future orders will be for the M1156A1 or E5.

The five-year contract also carries an industrial dimension. Precision artillery depends not only on producing steel shell bodies and explosive fill but on sustaining a supply chain for guidance electronics, navigation components, control mechanisms, testing equipment and specialized assembly capacity. An IDIQ vehicle extending to 2031 gives the Army the flexibility to place orders as operational requirements and appropriations evolve while preserving access to an established production base. The fact that the solicitation produced one bid underscores the specialized nature of the capability, although the contract announcement does not establish that the procurement itself was formally sole-source. For the Army, the larger objective is the ability to combine the mass associated with conventional 155mm ammunition with a growing inventory of guidance kits that can make that mass substantially more accurate and operationally efficient.

The $862.8 million M1156 contract reflects a wider shift in U.S. artillery modernization: precision is increasingly being treated as a capability that must be available at scale rather than reserved for a limited inventory of specialized weapons. PGK offers the Army a way to extract greater battlefield value from existing 155mm ammunition by inserting guidance technology into projectiles already compatible with widely fielded howitzers. At the same time, the progression from the original XM1156 to M-code-equipped and anti-jam variants highlights the next challenge for precision fires—maintaining accuracy when navigation signals are being actively disrupted. With an ordering framework extending through 2031, the Northrop Grumman award gives the Army a mechanism to expand that capability while balancing three requirements that are becoming inseparable in modern artillery warfare: precision, ammunition mass and resilience under electronic attack.

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Written by Teoman S. Nicanci – Defense Analyst, Army Recognition Group

Teoman S. Nicanci holds degrees in Political Science, Comparative and International Politics, and International Relations and Diplomacy from leading Belgian universities, with research focused on Russian strategic behavior, defense technology, and modern warfare. He is a defense analyst at Army Recognition, specializing in the global defense industry, military armament, and emerging defense technologies.