These are original Codex Grey Imperial Guard.
Their transport is the Halycon Aliens APC.
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The most recent Forgeworld newsletter showed off some new Imperial Guard trailers which are perfect for additional scenery and scenario potential to the battlefield.
I suspect I am not the only Ork player who has thought about using the fuel tanker as the basis for an Ork Skorcha conversion!
Hopefully they will release them in epic scale as well (which will then make them perfect for my Ork Airfield Defence Force).