At the U.S.Defense Department, spokesman Bryan Whitman said there is always concern that the use of force by the military could lead to reprisals.

VOA: standard.2009.04.13

"There is no evidence that the U.S.is any less strong than it has always been.

VOA: standard.2010.03.18

"If there's anything lingering it's, 'Could we have done something.' That's always there."

VOA: standard.2010.02.08