M777 howitzer

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M777 Lightweight Towed Howitzer

Type	towed howitzer
Place of origin	United Kingdom
Service history
In service	2005–
Used by	USMC, US Army, Canadian Forces
Specifications
Weight	3,175kg. (7,000lb.)
Length	10.7m (35ft.) in firing position; 9.5m (31ft. 2in.) towed position
Barrel length	39 calibers
Crew	5

Caliber	155 mm
Carriage	split trail
Rate of fire	2 RPM normal, 5 max
Effective range	24 km with M109 ammunition, 30 km with ERFB base-bleed, 40 with Excalibur

USMC gunners test a new M777 howitzer.

The M777 howitzer is a towed artillery piece developed by British Vickers group, and is produced by BAE Systems Land Systems in the US. It is in the process of replacing the M198 howitzer in the United States Marine Corps and United States Army. The M777 is also being used by the Royal Regiment of Canadian Artillery, and has been used in action in Afghanistan along with the associated GPS-guided "Excalibur" ammunition. It is also being assessed in trials by the British Army as a candidate for replacing the L118 Light Gun in some Regiments.

1 Design
2 Fielding
3 Specifications
4 See also
5 References
6 External links

[edit] Design

The M777 began as the Ultralight-weight Field Howitzer (UFH), developed by VSEL's armaments division in Barrow-in-Furness, United Kingdom. In 1999 VSEL was merged into the new BAE Systems RO Defence. This unit became part of BAE Systems Land Systems in 2004. Although developed by a British company, final assembly is in the USA. BAE System's original US partner was United Defense. However in 2005 BAE acquired United Defense and hence is responsible for design, construction and assembly (through its US-based Land and Armaments group). The M777 uses about 70% US built parts including the gun barrel.

The M777 is lighter and smaller in size, weighing under 9,000lbs (4,100kg), 42% lighter than the M198 it replaces. Most of the weight reduction is due to the use of titanium. The lighter weight and smaller size allows the M777 to be transported by USMC MV 22 Osprey, helicopter or truck with ease, meaning it can be moved in and out of the battlefield more quickly than the M198. The smaller size also improves storage efficiency in military warehouses and Air/Naval Transport as cargo. There is also a reduction in the gun crew size required; from 9 to an Operational Minimum of 5.^[1]

The M777 uses a digital fire control system similar to that found on self propelled howitzers such as the M109A6 Paladin to provide navigation, pointing and self-location, allowing it to be put into action more quickly than traditional towed and air-transported howitzers. This system called Towed Artillery Digitization (TAD) is produced by General Dynamics. The Canadian (CDN) M777 in conjunction with the traditional "glass and iron sights/mounts” also uses a digital fire control system called Digital Gun Management System (DGMS) produced by SELEX. This system has been proven on the British Army Artillery's L118 Light Gun over the past 3 to 4 years.

The M777 is also often combined with the new Excalibur GPS-guided munition, which allows accurate fire to 30 km. This almost doubles the amount of land area covered by a single battery to about 5,000 km². Testing at the Yuma Proving Ground by the US Army placed 13 of 14 Excalibur rounds, fired from up to 24 km away, within 10 meters of their target,^[2] suggesting a circular error probable of about 5 meters.

[edit] Fielding

USMC M777 at the 2006 Miramar Air Show.

In May of 2005, 3rd Battalion, 11th Marines, based at Marine Corps Air Ground Combat Center Twentynine Palms, became the first Marine unit to begin fielding the new M777. 380 systems will be supplied to the Marines, and 273 to the U.S. Army and National Guard.

In December of 2005 The 1st Regiment Royal Canadian Horse Artillery conducted an inaugural firing of its first 155 mm M777 towed howitzers, for of a total of six guns. The six guns delivered were supplied by the United States Marine Corps under a Foreign Military Sales (FMS) contract between the U.S. and Canada. The guns were deployed to Afghanistan in support of Operation Archer, and were put into service in the Canadian theatre of operations around Kandahar in early 2006. In the summer they made a significant contribution during the Battle of Panjwaii when a small number of rounds were used to huge effect on Taliban elements retreating from the battle area. Many of the 72 reported killed during the heaviest period of fighting were due to artillery fire from only two of these guns. In late fall of 2006, the Canadian M777 Howitzers were equipped with the Digital Gun Management System, which greatly improved accuracy and lead to these guns being used for Short Range Close Support of Canadian and US ground forces. However, until early 2007, ammunition supplies were constrained and led to reduced firing.^[3] They proved so successful that an order for an additional six guns was placed with BAE, with an option for an additional fifteen.^[2]^[4]

In June of 2007 the M777 in its A2 configuration was assigned to the U.S. Army's 3rd Battalion, 321st Field Artillery Regiment. 3-321 FA deployed to Afghanistan in support of Operation Enduring Freedom in December of 2007 and has become mission capable since January 2008 making 3-321 FA the first U.S. Army unit to utilize the M777 in combat. In April 2008, the M777 was deployed for testing with the 2nd battalion, 8th Field Artillery of the U.S. Army at Fort Wainwright in Fairbanks, Alaska.^[5]

[edit] Specifications

As above and:

Length:
- 30.4 ft (9275 mm) in tow
- 33.5 ft (10210 mm) firing mode
Width:
- 9.1 ft (2770 mm) in tow
- 12.2 ft (3720 mm) firing mode
Height: 7.4 ft (2260 mm) in tow
Barrel life: 2650 firings
Maximum effective range:
- conventional ammunition (unassisted): 24.7 km (15.3 mi),
- rocket-assisted projectile: 30 km (18.6 mi),
Rate of fire:
- 5 round/min, rapid
- 2 round/min, sustained