32 C.F.R. § 536.142
Normally, a member of an FCC will be either a commissioned officer or a claims attorney. At least two members of a three-member FCC must be JAs or claims attorneys. In exigent circumstances, a qualified non-lawyer employee of the armed forces may be appointed to an FCC, subject to prior approval by the Commander USARCS. Such approval may be granted only upon a showing of the employee's status and qualifications and adequate justification for such appointment (for example, lack of legally qualified personnel). The FCC will be limited to employees who are citizens of the United States. An officer, claims attorney, or employee of another armed force will be appointed a member of an Army FCC only if approved by the Commander USARCS.
32 C.F.R. § 536.142