M102 howitzer
The M102 is a light, towable 105 mm howitzer used by the United States Army in the Vietnam War, the Gulf War, and the Iraq War. Wikipedia
Barrel length: 32 calibres
Caliber: 105 mm (4.1 in)
Crew: 8
Effective firing range: 11.5 km (7.1 miles)
In service: 1964–present
Maximum firing range: 15.1 km (9.4 miles) with rocket-assisted projectile
Rate of fire: Maximum: 10 rpm; Normal: 3 rpm