law: 101. Summoning witnesses.-
  (1) The convening officer, the presiding officer of a Force Court, the Judge Attorney or, as the case may be, the Deputy Judge Attorney-General or the Additional Judge Attorney-General or the officer approved under section 95 or the Commanding Officer of the accused person may, by summons under his hand, require the attendance, at a time and place to be mentioned in the summons, of any person either to give evidence or to produce any document or other thing.
  (2) In the case of a witness who is subject to this Act or any other Act relating to the armed forces of the Union, the summons shall be sent to his Commanding Officer and such officer shall serve it upon him accordingly.
  (3) In the case of any other witness, the summons shall be sent to the magistrate within whose jurisdiction he may be, or resides, and such magistrate shall give effect to the summons as if the witness were required in the court of such a magistrate.
  (4) When a witness is required to produce any particular document or other thing in his possession or power, the summons shall describe it with reasonable precision.