Israel testing prototype of 10x10 Roem Sigma as successor of its M109 self-propelled howitzers.

Israel Defensa tweeted on November 12 that images were broadcasted showing tests carried on with one of the prototypes of Elbit Systems’ 155mm 10x10 Roem (Sigma), the vehicle that will replace the hundreds of M109s in the Israel Artillery Corps in the coming years. Each Roem will have the fire capacity of four M109s.
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The Roem/Sigma 155 mm self-propelled howitzer is based on a modified American-made Oshkosh 10x10 military truck chassis with an armored cabin at the front that can provide ballistic and mine protection for the crew. (Picture source: screenshot tweeted by Israel Defensa)

On January 9, 2022, Army Recognition published that the first picture of the Israeli-made Sigma 155mm 10x10 wheeled self-propelled howitzer has been released on the Twitter account of Caesar (@Ninja998998). The Sigma is a new generation of 155mm 10x10 wheeled self-propelled howitzer designed and developed by the Israeli company Elbit Systems.

In August 2021, Army Recognition reported that Elbit Systems had developed a new truck-mounted 155mm self-propelled howitzer to meet a need of the Israeli army. Nowadays, wheeled howitzers become very popular for all armies in the world offering the advantage of being lighter and more easily deployable by fast reaction units using military transport aircraft. It also offers a high level of mobility and simplified logistics.

The Roem/Sigma 155 mm self-propelled howitzer is based on a modified American-made Oshkosh 10x10 military truck chassis with an armored cabin at the front that can provide ballistic and mine protection for the crew.

The rear part of the Sigma is fitted with a turret-mounted artillery system consisting of a 155 mm/52 caliber barrel with a fully automatic loading system.

According to Janes, the Sigma is equipped with a remotely-controlled automatic loading system that sets the fuze and loads the projectile; the Uni-Modular Artillery Charge System (UMACS) with the primers will then be automatically loaded via a separate magazine.

The vehicle has a crew of three. Depending on the mission, SIGMA is capable of automatically selecting and loading the required projectile, propellant and fuze and laying the gun to optimally engage targets. According to Janes' website, the Sigma is equipped with a remotely-controlled weapon station including an automatic loading system that sets the fuze, and loads the projectile; the Uni-Modular Artillery Charge System (UMACS) with the primers will be automatically loaded via a separate magazine.

In November 2021, Elbit Systems announced a contract valued at approximately $106 million to supply Sigmas to an undisclosed country in Asia-Pacific.

The rear part of the Sigma is fitted with a turret-mounted artillery system consisting of a 155 mm/52 caliber barrel with a fully automatic loading system. (Picture source: screenshot tweeted by Israel Defensa)

Roem/Sigma 155 mm self-propelled howitzer is based on a modified American-made Oshkosh 10x10 military truck chassis with an armored cabin at the front that can provide ballistic and mine protection for the crew. (Picture source: screenshot tweeted by Israel Defensa)

Roem/Sigma 155 mm self-propelled howitzer (Picture source: screenshot tweeted by Israel Defensa)