A very quick Google search brought up their statues which states
http://www.knightstemplar.org/csd.pdf
OFFICERS Section 19. The Officers of the Grand Encampment shall be: A Grand Master, A Deputy Grand Master, A Grand Generalissimo, A Grand Captain General, A Department Commander for each department into which Grand Commanderies and Subordinate Commanderies may be grouped, A Grand Senior Warden, A Grand Junior Warden, A Grand Prelate, A Grand Treasurer, A Grand Recorder, A Grand Standard Bearer, A Grand Sword Bearer, A Grand Warder, A Grand Captain of the Guard,
The first four of whom and the Grand Treasurer and the Grand Recorder shall be elected and installed.
The Department Commanders and a Grand Prelate shall be appointed by the Grand Master and shall be installed. The remaining officers shall be appointed by the Grand Master and shall not be installed. (1964, p. 6 & 334 - 338)