This probably accounts for this Sergeant's lack of breastplate and other regulation equipment; note also the lascannon gunner's lack of standard issue helmet and other gear; both men are very likely colonial volunteers serving with The Guard. And good for them.
...If I ever do a company command squad I'll go bigger and bolder, but for platoons, I think this looks quite appropriate.)
The 9th Nepenthe has a long and glorious history in the service of The Emperor, but it's a helluva yarn and I'm a bit weary to get into it now....
"For the Emperor!!!!"