Thanks, all, for the suggestions. That helps a lot! I do not have any of the items mentioned above, so I will definitely be getting them. I may have to do some of the gray missions just to get more commendations. The mission I was stuck on last night is the Polith Mine Fields. The mine objective was no problem to achieve, but I seem to lack the fire power needed to destroy the big ship at the end. Still had plenty of missiles left, but I ran out of time.