I'm curious as to why the proponents of the "embed the url" want users to remember the url. I would have thought they'd want users to remember either the name of the site or what you represent.
To be honest, though, I wouldn't have a big issue with the suggestion but for one thing - what's suggested isn't memorable. It might have been okay if it was just /remembrance or /dor, but I don't think the two together are catchy.
Studies that support your case would be nice to have, but I don't believe there is a lot freely available. I know Nielsen has done some research (for $), and he has some URL as UI info freely available, but you might be faced with battling this without metrics (hopefully someone will post something that proves my fear ungrounded).
I'd hazard a guess that casual browsers of the USHMM website will remember the main url but nothing below it - certainly not something that lacks semantic traction as suggested.