(c) Payment

Subpoenas issued under subsection (a) are issued upon approval of the court. Therefore, whether the subpoena is served by the Marshal or by another individual, upon presentation to the United States Marshal of a properly executed claim form, certified by the federal defender, an assistant federal defender, or by the clerk upon affidavit of other court- appointed counsel (see 28 U.S.C. §1825), the Marshal shall pay the fees of the witness so subpoenaed as provided in Fed. R. Crim. P. 17(b)).