A is for Antedian fellatio techniques.
B is for Best Destiny. Commanding a starship was James Kirk's, and his first.
C is for Cardassian traitors.
D is for Delta radiation.
E is for Erectile dysfunction caused by exposure to Delta radiation.
F is for France, which seemingly still exists as a distinctive nation-state on United Earth during the span of Trek history.
G is for Gomtuu. AKA Tin Man.