Crozier of course was real, and died, with Franklin in about 1848. Franklin was 60, at this time. (He had been a signal midshipman at Trafalager --- certainly not as cute as Jack Hammond, working signals!)
But Crozier was younger so I think the timeline is off.
I know, I'm such a geek. But Crozier... he's so cool.
Would stories about him count as AOS?