Several large 12-wheeled military vehicles carrying mobile missile launchers rumbled across the southwest Oklahoma prairie on Tuesday as Ukrainian soldiers near the completion of weapons training. The Patriot missile system, which hasn’t yet been deployed in Ukraine, is used to defend population centres and critical infrastructure. The Ukrainians are expected to leave Oklahoma in the next several days for additional training in Europe before they deploy to Ukraine with a Patriot missile battery that typically includes six mobile launchers, a mobile radar, a power generator and an engagement control centre.