Sec.  2.406   National defense; free service.

   Any common carrier subject to the Communications Act may render to any
   agency of the United States Government free service in connection with the
   preparation for the national defense. Every such carrier rendering any such
   free service shall make and file, in duplicate, with the Commission, on or
   before the 31st day of July and on or before the 31st day of January in each
   year, reports covering the periods of 6 months ending on the 30th day of
   June and the 31st day of December, respectively, next prior to said dates.
   These reports shall show the names of the agencies to which free service was
   rendered pursuant to this rule, the general character of the communications
   handled for each agency, and the charges in dollars which would have accrued
   to the carrier for such service rendered to each agency if charges for all
   such communications had been collected at the published tariff rates.