law: 168. Execution of sentence of imprisonment in special cases.-
  Whenever, in the opinion of an air or other officer commanding a group, any sentence or portion of a sentence of imprisonment cannot for special reasons, conveniently be carried out in a military or air force prison or in air force custody in accordance with the provisions of section 166 such officer may direct that such sentence or portion of sentence shall be carried out by confinement in any civil prison or other fit place.