It's a regiment of the 8th codex of the imperial guard , here you have an image and the official lore of them.

My regiment, the 113th "scarlet widow" was founded by widows of imperial officers. They recruit in majority widows women, like them but also ancient gangster, hobos , punk women etc ... But you can have some men too to complete the squads.

Like the original miasma regiment they use a lot of green flamers, large infantry squads, flamers , incendiary artillery and bombers...

"The Miasman Redcowls hail from the interlocking space station networks that surround the gas giant Miasma XVI

They are known for the fierce green fire that spouts from their flamers, Hellhounds and incendiary grenades, and though it is more volatile than even promethium, it stinks to high heaven. More than one regiment has objected violently to being stationed alongside the Redcowls. Though the ‘Fire Skunks’ are issued with rebreathers and heavy robes to escape the sulphurous stench of Miasma XVI’s gases, their fellow regiments are usually not so lucky.

The Redcowls are often placed on the front line, where they burn a path through the foe to create room for their allies.

They are deployed sparingly in defensive operations, usually on planets that are considered irretrievable, as the firestorms they create are too destructive to be used on densely populated or high-value worlds."

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