The M108 was first fielded in 1962, as a replacement for the troubled M52 selfpropelled howitzer. It was developed from the T195 selfpropelled gun testbed, which itself was later furtherdeveloped into the 155 mm T196 six months later.
The M108 was intended to be the shortranged component of a new generation of US Army selfpropelled artillery, alongside (from shortest range to longest) the 155 mm M109, the 203 mm M110, and the 175 mm M107. Though unimpressive compared to the M109, the range of the M108 filled a wide gap between the minimum range of 155 mm selfpropelled artillery, and 120 mm mortar carriers.
Though effective in combat during the Vietnam war, the M108 was considered lacking in lethality compared to larger 155 mm howitzers (despite the fact that 105 mm rounds are comparable in payload to 120 mm mortar rounds, and the aforementioned range gap between these and 155 mm shells), and it was gradually phased out of service from the US military in the early 1970s. The M108s removed from US service were gradually passed on to allies, and replaced by additional M109s in US service. The M108 has been operated by USA, Belgium, Brazil, Spain Taiwan, Turkey. The M108 fleets in the militaries of Belgium and USA have both been retired, but as of 2010, this weapon continues to see service in Brazil, Spain, Taiwan, and Turkey.
The M108's main gun is a rifled 105 mm M103 howitzer, with a tube 30 calibers long, fitted to an M139 mount. It fires a 14.9 kg projectile at 472 m/sec, can elevate and depress to +75 and 6 degrees respectively, and has an effective range of 11.16 km. The M103 fires HE, WP, smoke, and chemical rounds, and also the M67 HEAT round. It can also fire all standard NATO 105 mm rounds, with the exception of rocketassisted munitions. A 12.7 mm M2HB heavy machine gun is usually fitted to the rooftop skate mount, providing the M108 with some degree of protection against aircraft and enemy personnel. 87 105 mm rounds are carried, along with 600 12.7 mm machine gun rounds.
The M108's aluminum armor provides sufficient protection from blast overpressure, shell splinters, and small arms fire (up to 12.7 mm AP over the frontal arc), but it has no spall liners or NBC system. Due to its lack of an NBC system, M108 crews must exercise maximum caution when firing chemical rounds, as contamination by their own munitions could result from a headwind from the impact area.
The M108 has a crew of 5 men. The driver's position is in the aforementioned location, while the section chief, gunner, and 2 cannoneers reside in the turret. Crew accommodations are austere, and the M108 does not have an air conditioner or heater as standard equipment.
The M108 is powered by a Detroit Diesel 8V71T diesel V8, generating 425 hp at 2300 rpm, mated to an Allison XTG4112A automatic transmission with 4 forward gears, and 2 reverse gears. 511 liters of fuel are carried, giving the M108 a maximum range of 386 km. With 425 hp driving 21 tonnes, the M108 has a power/weight ratio of 20.32 hp/tonne, and a governed top speed of 56 km/h.
The M108's suspension is a standard torsion bar system, with 7 individuallysprung roadwheels, and a T136 or T137 track, both with 79 shoespertrack. The track is a "flat track" type, with no return rollers; the drive sprocket is forward and idler rear. Combined with the vehicle's weight, its track footprint gives the M108 0.69 kg/cm² of ground pressure.
The M108 is 6.1 m long, 3.15 m wide, 3.27 m tall, has no gun overhang, and weighs 21 tonnes. It can tackle a 60% gradient, a 30% side slope, a 0.53 m vertical obstacle, or a 1.8 m trench. It has 0.45 m of ground clearance, and is amphibious with preparation.
The M108's unit cost is approximately $244 000, though it is no longer offered. No information is available on the size of its production, though several hundred are still in use today.

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M108 Self Propelled Howitzer | 105mm Mobile Artillery