Most likely, they switched to self adjusting brakes around 2016. They do need to be initially adjusted properly upon installation, after that they self adjust only in the forward direction.
Based on the spec sheets on the GD website it will have self adjusting brakes. Just be aware that because of COVID and supply issues that may not be the case. I would call GD customer service with your VIN to confirm. As well even the self adjusting brakes need a proper manual adjustment the first time for them to adjust properly.