Couple more missions before I move off to the story mission.
A Milk Run mission: Mission #6 here;
And a defense mission: Mission #7 here;
The defense mission was harder seeing as how it is difficult to defend in depth in this game? I guess I could have moved out into the valley in front of the maintenance station I was defending but that would be bold. Also learnt that there are firing arcs and that your missiles will not do a 180 and hit something behind you.