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Space marine with bolter--Roll 1d6 for shooting on a 6 it kills, sustained fire. Assault-- 1d6-1
Space marine with flamer-- Same rules as flamer except 3+ if directly under and 5+ if in the same area. Assault-- 1d6-1
Space marine with missle-- The target of the missle is a 2+ to kill anything adjacent to the target is a 5+. Assault-- 1d6-1
Any Serg with pistol and cc weapon-- Bolt pistol- range:12 squares, roll 1d6 the roll of a 6 kills, sustained fire. Assault-- 1d6

Just some rules you could use for home-made missions it worked for me. Maybe even try mixing termis and regular space marines.