; (ii) small providers; and (iii) rural providers; (G) providers of communications services using satellite communications networks; (H) Federal agency spectrum users; and (I) Tribal organizations. (2) Appointments (A) In general The Under Secretary shall appoint members to the CSMAC for up to a two-year term, except that members may be reappointed for additional terms by the Under Secretary. (B) Removal Each member appointed under subparagraph (A) shall serve on the CSMAC at the pleasure and discretion of the Under Secretary. (3) Chair (A) Appointment The Under Secretary shall appoint one or more members from among those appointed to the CSMAC to serve as Chair or Co-Chairs of the CSMAC. (B) Service The Chair, or Co-Chairs, as the case may be, shall serve at the pleasure and discretion of the Under Secretary. (4) Vacancy A vacancy on the CSMAC shall be filled in the manner in which the original appointment was made and the member so appointed shall serve for the remainder of the term. (5) Compensation The members of the CSMAC shall serve without compensation. (d) Subcommittees (1) Authority Subject to the approval of the Under Secretary, as the Under Secretary determines necessary for the performance by the CSMAC of the duties described under subsection (b), the CSMAC may establish subcommittees, working groups, standing committees, ad hoc groups, task groups, or other subgroups of the CSMAC. (2) Limitations and additional participation Any subcommittee, working group, standing committee, ad hoc group, task group, or other subgroup established under paragraph (1)— (A) shall report to the CSMAC; (B) may not provide any advice, recommendation, or other work product directly to the Under Secretary