R.I. Gen. Laws § 30-6-4: Personal performance of duty required.

No commissioned officer or warrant officer or enlisted person in the national guard shall receive the compensation provided for in chapters 1 — 14 of this title unless he or she personally performs the duties prescribed by law, and no substitute shall be allowed compensation for service belonging to another to perform, nor shall excuses granted for absence from, or nonperformance of, militia duty entitle the person excused to receive this compensation.