Defense Secretary Leon E. Panetta (center) steps off his jet after arriving at Yokota Air Base on the outskirts of Tokyo on Sunday, Sept. 16, 2012. Mr. Panetta is in Japan as part of an Asian tour, which includes stops in China and New Zealand. (AP Photo/Larry Downing, Pool)

Photo by: Larry Downing

Defense Secretary Leon E. Panetta (center) steps off his jet after arriving at Yokota Air Base on the outskirts of Tokyo on Sunday, Sept. 16, 2012. Mr. Panetta is in Japan as part of an Asian tour, which includes stops in China and New Zealand. (AP Photo/Larry Downing, Pool)