Battlestation: First Contact episode 3 tips and advice

My assumption is that your marine shuttle should be available again after capturing a bad-guy ship. However, it never seems to become available again.

One thing I accidentally discovered and have since used is:
- Capture a capital and finish the wave, you'll see the "wave complete/game saved" message
- Back out to the main menu
- Go back into the game. Voila! Your marines are available.

Being able to capture multiple capitals really makes marines worthwhile again.