A is for the Aurora, the groovy little spaceship commandeered and used by Dr. Sevrin and his followers in 2269.
B is for Braums. Dr. Leah Braums. Who bore a very striking resemblance to Captain Benteen. Right down to the mole.
C is for Constellation-class starships of the late 23rd and the 24th centuries.
D is for the USS Defiant. Which dissappeared through a interspatial rupture in the Tholian sector.