A is for Antimatter Magnetic Containment Bottle.
B is for Betelgeusian Ambassador the Federation.
C is for Cargo Pods that Chekov found on Ceti Alpha V. That were of a current design and not possibly left behind with Khan all those years ago.
D is for David Marcus.
E is for the Enterprise-J. She existed in at least one timeline and was momentarily visited by 22nd century Earth captain Jonathan Archer.