A sharp-eyed and sometimes lost Briton I know noticed this somewhat amusing error on a map in the Navy Yard Station.  It’s a mistake, but it’s pretty bad when a slip-up gets you 4-6 orders of magnitude off. Actually, the official name doesn’t use an apostrophe at all, as it’s a memorial to Vietnam veterans and not so much for them.  While they’re changing it, they might want to add the USIP as well. I presume Jim Graham can resolve up some funds.