The Tank Lords - David Drake

The Tank Lords is free for the kindle. If you like military science fiction you'll love this book. It's a collection of Hammer's Slammer stories in chronological story sequence.

Colonel Alois Hammer heads the mercenary armored force known as Hammer's Slammers. When a planetary government wants to win a war they call on Colonel Hammer. This is a series of stories that include everything from epic battles to small skirmishes. The Slammer's weapons are awesome engines of war, but the people who man them are only human. Very highly recommended.