Even the U.S. Air Force couldn't stop the Mighty Missouri River from flooding Offutt Air Force Base. Between Saturday night and early Sunday, the 55th Wing called off a 30-hour, round-the-clock sandbagging effort because the floodwaters were rising too fast. "It was a lost cause. We gave up," said Tech. Sgt. Rachelle Blake, a 55th Wing spokeswoman. By Sunday morning, one-third of the base was underwater, she said. About 60 structures have been damaged, mostly on the south end of the base.