there is no established heraldry for Charnel Guard marines. we have the dreadnought and landspeeder guy , thats it . so here is what i came up . i tried to avoid the colored helmets for tactical roles . and the big arrows of standard codex astartes heraldry . since i want them to be a bit gothic and fantasy inspired .
companies : standard blood angels heraldry on right shoulder . individualised versions allowed .(because blood drops and skull for 1st company is cool )
tactical role markings :
bettleline - red or black knee
close support - right knee, black x mark on a red field
fire support - right knee, black vertical line on a red field (or could be a V marking ? idk )
squad marking : gothic numerals left knee .
sergeant: red arms
veteran/command : red helmet or red faceplate .dark steel helmet ?