ROCK ISLAND, Ill.—Inside the stout federal courthouse of this Mississippi River town, the dirty secrets of Iraq war profiteering keep pouring out.

Hundreds of pages of recently unsealed court records detail how kickbacks shaped the war's largest troop support contract months before the first wave of U.S. soldiers plunged their boots into Iraqi sand.

The graft continued well beyond the 2004 congressional hearings that first called attention to it. And the massive fraud endangered the health of American soldiers even as it lined contractors' pockets, records show.

A common thread runs through these cases and other KBR scandals in Iraq, from allegations the firm failed to protect employees sexually assaulted by co-workers to findings that it charged $45 per can of soda: The Pentagon has outsourced crucial troop support jobs while slashing the number of government contract watchdogs.