Wholesale Weapon by Michael Z. Williamson

[Baen] Kenneth Chinran was a disaffected youth who joined the military and was recruited for an elite deep cover unit, shrugging off training and exercises so tough that several of the recruits did not survive. Then he was sent by his star nation to infiltrate a fascistic, militaristic planet Earth. He lived in deep cover for years, marrying and having a daughter. Then the Earth forces attacked his home system, and he and his team came out of hiding, attacking and destroying the infrastructure of the crowded planet, disabling transportation and communications in city after city. As a result of his attacks, billions died for lack of the food, water and power which the ravaged system could no longer supply. His sabotage was successful, but the deaths of so many weighs heavily on his mind, making him wonder if he can stay sane. Then the secret police discovered his identity. With his daughter, the only thing in his life that had so far kept him human, he was on the run, while the resou