The Warrior's ApprenticeLois McMaster Bujold
science fiction > military science fiction + space opera
Miles Naismith Vorkosigan's first task is to conquer himself. After that, the universe will be easy...
After failing to pass the physicals for the Barrayaran Military Academy, the brittle-boned, dwarfish son of Cordelia and Aral Vorkosigan refuses to be daunted for long. An ill-advised impulse to rescue others, even if (or is that, because?) he cannot save himself, leads Miles to a galactic adventure that would most definitely not have been approved by his concerned parents, if he had mentioned it to them.
Miles pushes the dictum "It is easier to gain forgiveness than permission" to its limits as a chain of self-inflicted circumstances leads him into a war zone. Where, to his dismay, he discovers it's not a game any more... and the consequences of his attempted chivalry can become a deadly threat to all he holds dear.
Lois McMaster Bujold (born 1949) is an American speculative fiction writer. She is one of the most acclaimed writers in her field, having won the Hugo Award for best novel four times, matching Robert A. Heinlein's record, not counting his Retro Hugo. Her novella "The Mountains of Mourning" won both the Hugo Award and Nebula Award. In the fantasy genre, The Curse of Chalion won the Mythopoeic Award for Adult Literature and was nominated for the 2002 World Fantasy Award for best novel, and both her fourth Hugo Award and second Nebula Award were for Paladin of Souls. In 2011 she was awarded the Skylark Award. In 2013 she was awarded the Forry Award. In 2017 she won a Hugo Award for Best Series, for the Vorkosigan Saga.
The bulk of Bujold's works comprises three separate book series: the Vorkosigan Saga, the Chalion Series, and the Sharing Knife series.