While the paratroopers had specialized weapons, like the FG42 they still used the Kar 98 as their standard rifle.
This is a good kneeling position, he is leaning into the weapon.
While this does look like a Rambo pose, it's not.
The Germans did train to use the machine gun in the advance like this so they could lay down fire as they moved.
The officer figure is very good.
He's not just the typical guy waving or looking through binoculars.