We are aboard a warship with a crew that has been fighting an unidentified anemy for generations. People have become genetically-engineered soldiers who can take on a variety of forms. They are born human and later (or repeatedly, if they survive) undergo a metamorphosis into whatever form of soldier is needed at that time. Soldiers undergoing their transition ('elfstate') can admire each other but none can form a lasting liaison, because everyone is born with a single purpose and the desire to fulfill it. As soon as their transition is complete they leave their ship and start fighting the enemy. The bleakness of this endless war without love or family, and that neither side can win, has stayed with me. I'd love to read it again, if it rings any bells for someone.
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