When strong storms pushed across Nebraska last week they damaged two planes critical to making sure our nation continues to function during a major crisis.

Two of the four so-called "doomsday planes" are now out of commission after being hit by a tornado last week.

The planes are kept at a base south of Omaha and would be called into action as the control hub for the president. Secretary of Defense and joint chiefs in the case of a national emergency or attack.

Officials told NBC News that while half the fleet is not operation -- the other two can still carry out the mission of the doomsday planes. Eight other aircraft were damaged at the base by the tornado. All eight have since been repaired.