Possibly, based on his profession, someone who is mentally strong, someone he doesn't have to take care of. Basically every guy just wants a girl he live in the moment with, so be likable and a strong character.. no jersey shore crap, keep it responsible, respectful and most importantly FUN.. hope I helped out.
One that understands you have crazy hours and that you have chosen a calling where you serve others and doesn't get jealous of both the physical and mental effort you put in this job.