The US Army has picked American Rheinmetall Vehicles and HDT Expeditionary Systems to build prototypes for the Small Multipurpose Equipment Transport (S-MET) Increment II program.

This is the latest chapter in the story of this program which should eventually lead to the selection of a single robotic vehicle in 2027, followed by acquisition of some 2,195 units. 22 million USD have been awarded in total between the 2 companies, which will have to deliver 8 prototypes each. The original S-MET (Increment I) was intended to field an existing radio-controlled platform quickly to help with infantry overburden by taking load off the soldier’s backs and also generate power for organic electronic systems. The maximum payload request for Increment I was 1,000 lbs.

S-MET Increment I saw the selection of the General Dynamics Multi-Utility Tactical Transport (MUTT) in its 8x8 configuration, with a contract awarded in July 2020 to deliver 624 systems by 2025 and deliveries from late 2022. Its compact 2.9 m (116 in) X 1.5 m (60 in) size allows it to move through tight terrain and can be transported in helicopters.

S-MET Increment I actual payload capability is 1136 kg (2500 lb) which permits carriage of water, ammunition, rations, spare batteries, and other supplies in significant quantities. MUTT has also been experimented fitted with radios for communications relay, or heavy weapons. S-MET is primarily intended for use within Infantry Brigade Combat Teams, Explosive Ordnance Disposal, and Security Force Assistance Brigades.

Increment II vehicles requirements are for at least twice the payload that was required of S-MET Inc I (2,000 lbs) while also delivering higher exportable power to enable modern mission payloads like Unmanned Air Systems and communications equipment and being quieter to have an improved audio signature. They are also required to have a dismounted, wireless, mesh communication network capability, a modular architecture, increased reliability and a wider range options for recharging, with worldwide grid compatibility.

Surprisingly, General Dynamics Land Systems has not secured an Increment II contract. The other company that had filed a proposal was Anduril, teamed with South Korean defense giant Hanwha.

American Rheinmetall Vehicles LLC (ARV)’s entry is the MISSION MASTER SP (Silent Partner), an 8x8 powered by a low-signature electric motor. The MISSION MASTER line of UGVs has secured interest and orders in other countries, including Japan and the UK, where it has been extensively tested also in Armed and ISTAR configurations.

HDT Expeditionary Systems Inc. has entered its HUNTER WOLF 6x6, which uses a self-charging hybrid-electric drivetrain.

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