It is possible to complete each mission in just one turn if you select the
Imperial Fists division and choose the Heavy Weapon order. This enables your
marines and the captain to move and fire twice in the same round.
Choose a mission. Enter it and then on your first round of play initiate your
Heavy Weapon order. Don't use your bolter marines but move the rest of them
twice and fire twice with all of the squad. Click on any marine and all of
his movement and fire orders are restored enabling you to use him again. This
works for all of the non-bolter group enabling you to move fire and complete
the mission all within one turn and without any enemy getting the opportunity
to fire at you.