Two books that I just finished and want to recommend, ESPECIALLY to aspiring or new officers.
1) One Bullet Away by Nathaniel Fick (USMC, Ret.)
and
2) The Unforgiving Moment: A Soldier's Education by Craig M. Mullaney (US Army, Ret.)
Both of them were very good, similar in theme, but different enough to make both of them worthwhile. They both deal with the challenges that a 20-something officer will deal with, especially in terms of interacting with members twice their age and with far more experience, whom they now command.
If you've done BMOQ/BMQ, you'll laugh at the stories of basic training, even though one is US Army and the other a Marine, the experiences are at times, eerily similar to mine.
One Bullet Away's author attended Dartmouth, and his experiences again often mirror mine at civvy-U, so I enjoyed that, and the author of Unforgiving Moment went to West Point, and then was a Rhodes Scholar at Oxford, which was interesting to read as well.
Both end up leading platoons in Iraq and/or Afghanistan, and the perspective from which the stories are told give an interesting insight into the life of a young officer, both personally and professionally.
Cheers.