Also, with one exception, the poses are all based on contemporary photographs. The figure carrying a weapon on his shoulder is based on the famous picture of an FFL infantryman in Indo-China.
Explains why they lost then, poor weapon handling...

Even so, he's carrying the weapon using his hand as a counter-weight and not further back which requires effort.
Separate weapons makes a lot of difference actually, I'd assumed that they were fixed in place. I nearly commented that I'd seen the 'cradling weapon' pose before, but on the opposite side.
Consider my comments void if the weapons are separate.