If, as you say, the signs usually appeared near medical facilities, it could be for Navy Pier itself. From navypier.com: 1917-1918 When the U.S. enters World War I, the Pier houses several regiments of soldiers, Red Cross and Home Defense units as well as a barracks for recruits. 1918 - 1921 The Pier boasts its own streetcar line, theater, restaurants and an emergency hospital.
Forum: Forgotten Chicago Sightings

I went there on a grade school field trip in the late 1970s to see the Ringling Bros circus.
Forum: General Discussion

I remember going to an amusement park called Pioneer Park on a field trip in the late 1970s. Anybody know anything about this park? Location?
Forum: General Discussion

When I was in the Army Reserve, I drilled at the Orland Park site from 1990 until 1993. Used to walk out back and stand atop the silo covers. Army Maintenance Support Activity (AMSA) #45 operates the location now, though some of the land in the back has been sold. I remember two silo covers at the site, but the satellite view at Google maps reveals only one now. When I switched over to the Nati
Forum: General Discussion