XReality Group Limited (ASX:XRG) has revealed its Operator XR training software has been sold to a US government customer for the first time – none other than US defence. It’s a big milestone for a company with offerings catered to that sort of customer – XRG noted on Wednesday it “presents opportunities for follow on work.” Operator XR is what you’d imagine – a headset that allows for police and soldiers in training to immerse themselves, as best as possible, in lifelike hostile scenarios. Should it be a hit at the US Defence force, this could be a pivotal moment in the company’s ability to e…