I enjoy/experience/suffer (take your pick) three different dream themes:
1. Army. I was in the Army for two years, almost 50 years ago. No combat, not even in a war zone, and frankly I got all the possible breaks. Yet to this day I get Army dreams. Nothing relating to my actual Army experiences. Often I've been drafted into the Army for the third or fourth time.
2. Underground dreams. I can't put any particular autobiographical connection to this, as I can with the Army dreams. But a lot of my dreams occur in caves, in tunnels, etc. The dreams often including being in tunnels in the Army and so forth.
3. And office-invasion dreams. I worked for the US District Court for 36 years, and had the same office for all that time, until I retired in '96. Every now and again my dream is that people--squads and platoons of people, sometimes--are coming in, using, occupying my office. I chase some out, only to turn around and find others coming in another door or a window. Chase them out, and yet more are coming in another way. (I have yet to have an office-in-a-tunnel dream, or an Army-office dream.) Interestingly enough, the position I had has for a few years been unfilled, and the office has stood empty for that time.