PROLOGUE UNSC COLONY WORLD TRIBUTE, EPSILON ERIDANUS SYSTEM, JUNE 16, 2524 (MILITARY CALENDAR) The marines were in the air before dawn. Two four-man squads clipped to a pair of Hornet fast-attack aircraft: compact, high-wing planes that remained nimble despite the marines' combined bulk. For close to an hour the Hornets had matched the manic undulations of a volcanic plain and now—as they jerked back and forth to avoid the petrified trunks of a forest burned long ago—Staff Sergeant Avery Johnson had to work to keep his boots planted on his Hornet's starboard landing skid. Like the other marines, Avery wore charcoal fatigues and matte-black impact plating that bulwarked everything vital from his neck to his knees. His helmet encased his recently shaved head, and its silver-mirrored visor completely obscured his square jaw and brown eyes. The only place Avery's black skin showed was at his wrists where his leather gloves didn't quite touch his shirtsleeves. But even with the gloves, Avery's fingers were cramped with cold. Squeezing his hands into fists to keep his blood flowing, he checked the mission clock in his visor's heads-up display (HUD). Just as the luminous blue numbers hit 00:57:16, the planes crested a line of crumbling hills, and Avery and the other marines got their first line-of-sight view of their objective: one of Tribute's struggling industrial settlements; and, somewhere inside the town, a suspected Insurrectionist bomb-shop. Even