text: adding two more links in case useful for others:
  
  URL (inactive since 2019): https://web.archive.org/web/20260000000000*/https://parkslopeveteransmuseum.net/
  
  2016 article: https://www.untappedcities.com/a-secret-veterans-museum-hidden-in-the-park-slope-armory-brooklyn/
  inactive for ~10yrs: https://www.instagram.com/parkslopeveteransmuseum/
  2019: https://www.mattdellinger.com/news/untapped-cities-tour-brooklyn-14th-armory-park-slope
  
  I think this might be enough to conclude that this place is gone but, @jmapb if you think I'm off base your reactivation of this note won't offend me 
  