If you need more material there's a 18 page gouge pack of stuff on the navy ocs website.
I didn't see a reason why not to, even if it's just one line every night. The key I found for myself to memorization is of course repetition, but also repetition over a period of time. It allows for longer retention. Actors who play a roll for months remember their lines off hand for long time afterwards. I suppose I'm already chomping at the bit and it passes the time to hum the service songs.