The Jupiter III is a Cuban truck-mounted howitzer. It is a comfbination of a Soviet D-30 towed howitzer, mounted on a KrAZ-255B 6×6 military truck chassis. This artillery system was first publicly revealed in 2006.

This low-cost upgrade improved capabilities of an ageing field gun. Such developments are typical for countries with limited military funding.

Cuba developed a number of artillery systems using the same approach of merging existing but out-dated field guns and howitzers with various surplus chassis.

The D-30 field howitzer was developed in the Soviet Union in the late 1950s. It was widely exported. This howitzer is license produced in Cuba in small numbers. This artillery system can ƒιяє HE-FRAG, HE, smoke, illumination, and possibly some other ρяσנ є¢тιℓєs. Maximum range of ƒιяє of the D-30 is 15 km.

The gun is loaded manually. Maximum rate of ƒιяє is 6 to 8 rounds per minute.

It seems that this artillery system is operated by a crew of 5-6 soldiers.

Vehicle is powered by a YaMZ-238 turbocharged diesel engine, developing 240 hp. It is mated to a 5-speed manual gearbox. Vehicle has adequate cross-country mobility and can travel off-road. It seems that the cab of the Jupiter III has some degree of armor protection.

There is a whole series of Jupiter artillery systems developed in Cuba and based on KrAZ 6×6 trucks. A Jupiter IV 122 mm self-propelled gun, mounted on a heavily-modified KrAZ-255B chassis. The Jupiter V is a 130 mm self-propelled gun, which is also based on a heavily-modified chassis. Also there are some Cuban artillery systems based on tracked chassis.