The members are seated with the president, who is the senior member, in the center, and the other members alternately to the president’s right and left according to rank. If the rank of a member is changed, or if the membership of the court-martial changes, the members should be reseated accordingly. When an accused’s request to be tried by military judge alone is approved, the court-martial is ordinarily assembled immediately following approval of the request. In a special court-martial consisting of a military judge alone under Article 16(c)(2)(A), the court-martial is assembled prior to beginning of the trial on the merits. Assembly of the court-martial is significant because it marks the point after which: substitution of the members and military judge may no longer take place without good cause ( see Article 29, R.C.M. 505, 902, 912); the accused may no longer, as a matter of right, request trial by military judge alone or withdraw such a request previously approved ( see Article 16, R.C.M. 903(d)); and the accused may no longer request members even with the permission of the military judge, or withdraw from a request for members ( see Article 25(c)(2); R.C.M. 903(d)).