The Heritage Trilogy is the first of three connected trilogies about Marines in space, and consists of:
- Semper Mars
- Luna Marine
- Europa Strike
Three very good near future military SciFi stories, loosely connected at the micro level, with a deeper common background. My only small gripe is that Douglas does not concentrate more on the backstory of 
alien visitors in ancient times. Still and all, a very good read.
Note: Ian Douglas is a pen name for William H. Keith.
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