Crew management, explaination

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I am wondering if I should put people in every crew slot aboard your boat. When I first started a career, there were empty slots.

Some of my crew members have Skill in one area, and they have training(after a promotion, I guess) in a different area. This is unusual to me because the manual says to give them training(sorry I can't remember what it's called) in the same field as their skill.

I was submerged, and was depth bombed by some airplanes and my gun crew got injured. I think they wore scuba gear and continued to man their station. For this they get the medal of honor... they never left their post! haha! They were not visable on the 3D camera, so I know they werent actually at the guns.

Ok, so if a crew member turns red, what does that mean? I'm guessing injury, but how do you know if they're dead? Also, could you explain what I should do with my crew, i.e. have an officer or CPO incharge of each station(engineroom, control room, etc.) I wish there was some explaination in the manual detailing how you should manage the crew. I bet they think it's weird of their Capt. to replace a torpedo room dude with a watch dude.

Thanks for any help