I play tested a new list using the Imperial Fists in a lightning attack strategy. This combines the Imperial Fist legion strengths whilst remaining agile and fast moving. One unit required is the Javelin speeder squad.
I chose to use three of the same lascannon / MultiMelta combo Javelin speeders as there is significant fire power and coupled with speed they should be able to out manoeuvre the squads prey and get around to the sides and back to make attacks.