You guys are going to have to correct me on the details here...
im sure most of you have read Silent Running, I recently finished it...
The Jack picked up a prisoner or two while on patrol. I was shocked when i read this. The captain was reluctant to pick up any more but the one or two that were on board were well fed and put to work. The author even noted they gained noticeable weight after enjoying the food! The crew put them to work polishing the brass in the forward torpedo rooom
. And again he noted that for the first time since commissioning you could eat off the torpedo room floors and brass.
He mentioned his sadness when they returned to port and they handed off the prisoners to the marines and how they were treated in the short time he could visually see them being walked off the plank.