What would be the best crew skills for a Trooper? I have Armstech, Scavenging, and Diplomacy as my crew skills. So I was wondering if that would be a good set, if not what would be?

For Armstech, you want Scavenging for the metals and compounds, and Investigation for your researched compounds.

 

Armstech isn't a bad choice considering the companion bonuses to the crew skill.

 

My recommendation though is to go Armormech (if you absolutely want a crafting skill), as your 1st 2 companions use +Aim gear so they both can just get hand-me-downs regularly. Also, if you purchase Treek, she also uses Aim gear. This will help since you only will have to focus on Heavy Armor research.

 

As an aside: If this is your 1st character, there is nothing wrong with picking up 3 gathering profession as those will help fund future character crew skills.