Chain of command

"Lieutenant Sam Bitka, U.S. Naval Reserve, is getting used to civilian life when he is called back to active duty. Tensions between Earth and the alien Varoki are on the rise, and Sam is assiged as tactical officer aboard the deep space destroyer USS Puebla. Dispatched to the distant world of K'tok to protect human colonists, he wants nothing more than to serve out his active duty time and get back to his civilian life. But when the Varoki launch...