M549

155 mm M549 HERA
Color-coded section view of a rocket-assisted projectile ammunition round
Type	Rocket-assisted projectile
Place of origin	United States
Service history
In service	1970–present
Production history
Designed	1960s
Manufacturer	General Dynamics Ordnance and Tactical Systems
Specifications
Mass	96 lb (43.6 kg)
Length	34.39 in (873.5 mm) fused 33.8 in (858 mm) unfused 10.5 in (266.7 mm) rocket body
Diameter	155 mm (6.1 in)
Muzzle velocity	2,710 ft/s (826 m/s)
Maximum firing range	18.7 mi (30.1 km)[note 1]
Filling	M549 Comp B M549A1 cast TNT
Filling weight	M549 16.0 lb (7.26 kg) M549A1 15 lb (6.8 kg)
References	Janes[1]

The M549 is a high-explosive rocket-assisted (HERA) 155 mm howitzer round developed for use by the US military in order to add additional range to standard howitzers, with a maximum range 30.1 km (18.7 mi) from a M198 howitzer. The projectile has two distinctive pre-assembled components—the high-explosive (HE) warhead and the rocket motor, making it a form of rocket-assisted projectile. The warhead is fabricated from high-fragmentation steel for increased effectiveness in terms of damage caused to target and contains a bulk-filled explosive (either TNT or Composition B).

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