  The government had previously announced it would join the
whistle-blower lawsuit brought by former Armstrong teammate
Floyd Landis under the federal False Claims Act. Tuesday was the
deadline for the Justice Department to file its formal
complaint.     "Defendants were unjustly enriched to the extent
of the payments and other benefits they received from the USPS,
either directly or indirectly," the complaint said.  Armstrong,
who in January admitted using performance-enhancing drugs after
years of denials, has argued that the Postal Service's
endorsement of his team earned the government agency far more
than it paid him.  Armstrong attorney Elliot Peters called the
government's complaint "opportunistic" and "insincere."  "The
U.S. Postal Service benefited tremendously from its sponsorship
of the cycling team. Its own studies repeatedly and conclusively
prove this," Peters said. "The USPS was never the victim of
fraud. Lance Armstrong rode his heart out for the USPS team, and
gave the brand tremendous exposu