Chains of Command

The assault on Earth was thwarted by the destruction of the aliens’ seed ship, but with Mars still under Lanky control, survivors work frantically to rebuild fighting capacity and shore up planetary defenses. Platoon sergeant Andrew Grayson must crash-course train new volunteers—all while dulling his searing memories of battle with alcohol and meds.

Knowing Earth’s uneasy respite won’t last, the North American Commonwealth and its Sino-Russian allies hurtle toward two dangerous options: hit ...