Usually those signs symbolize that a hospital or medical institution is nearby. What existed near Navy Pier that merited such?. No, Northwestern is about 2-4 blocks NW.
No, This was more of a medical facility, As opposed to the more residential Lake Point Tower. Usually, Those signs signaled that a medical facility was in the zone or vicinity with that distinctive green cross. Northwestern would be a few blocks west, So that wouldn't actually count. But there was some sort of mariners or sickbay-type facility. I was just wondering which specific one?.
If, as you say, the signs usually appeared near medical facilities, it could be for Navy Pier itself. From navypier.com:
[quote]1917-1918
When the U.S. enters World War I, the Pier houses several regiments of soldiers, [b]Red Cross[/b] and Home Defense units as well as a barracks for recruits.
1918 - 1921
The Pier boasts its own streetcar line, theater, restaurants and [b]an emergency hospital[/b].[/quote]