I think that the last two lines in this paragraph should be tweaked. They might be rewritten so that they're easier to comprehend. Maybe something like this?

As soon as the garbled warning came over the W.A.V.E that the Locust fleet was on a collision course with Galea, the entire fleet became readily alert. Their mission became a waiting game. The only task that remained for the crew was to keep their shields and guns hot, ready to spin up at a moments notice.

Just a thought!