The book “Tank Lords” from David Drake’s Hammer’s Slammers is available at Amazon for free:
https://www.amazon.com/Tank-Lords-David-Drake-ebook/dp/B00AXAHZF0/ref=la_B000AP8T1C_1_5?s=books&ie=UTF8&qid=1488498127&sr=1-5&refinements=p_82%3AB000AP8T1C
Thanks for the heads up. I probably still have it in a box in the basement, but will grab the Kindle version to re-read on this pad.