Space Crusade

To complete a mission in one turn:

Select the Imperial Fist Division and choose the Heavy Weapon
order. Choose a mission and enter it, on your first round
initiate you Heavy Weapon Order. Don't use your Bolter marines,
but move the rest twice, and fire twice with ALL of the squad.
Click on any marine and all of his fire orders and movements
should be restored, enabling you to use him again and again....
This works for all the non-bolter marines in the group, enabling
you to move, fire and complete the mission, all within one turn
and without getting any problems from the enemy. (Information from Cheat Machine)