I was looking around and my search-fu is apparenty weak - Do Proton Rockets require you to SPEND a focus or simply HAVE a focus to use them?
Usually ordanence that uses target locks include the phrase "spend your target lock" as part of the cost. Even Blaster Turret says, "spend your focus". Proton Rockets do not say to spend a Focus, only that you have one. Does that mean you can spend the focus during the shot?
That's correct, you just have to have a focus, and you don't need to use it to fire them.