A is for Alpha Centauri (where Zephram Cochrane comes from)
B is for Betazed
C is for Cordrazine
D is for D5 Klingon battlecruiser
E is for the Enterprise, NCC-1701. No bloody A, B, C, or D.
F is for F-104 Starfighter, the type of military jet piloted by Captain John Christopher back in the year 1969.