A field hospital is read as care improvised under pressure. Tradition links it to crisis management, to doing what you can with little and to deciding what needs attention first.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.