; material error (1) Convening of board In the case of an officer or former officer who was eligible for promotion and was considered for selection for promotion by a selection board convened under section 20211 of this title but was not selected, the Secretary of the Air Force may, under regulations prescribed by the Secretary of Defense, convene a special selection board under this subsection to determine whether the officer or former officer should be recommended for promotion, if the Secretary must determine that— (A) the action of the selection board that considered the officer or former officer was contrary to law in a matter material to the decision of the board or involved material error of fact or material administrative error; or (B) the board did not have before it for its consideration material information. (2) Board composition