On Tue, 29 Nov 2011 15:40:18 -0500, "Greg \(Strider\) Moore"
wrote:

Was thinking about this earlier today.

Mercury had no real numbering system that I'm aware of (I'm sure it did, I'm
just not aware of it).
So you had Faith 7, Hope 7, etc.

Mercury had a "Mercury (Booster) Number" designation.

Shepard flew Mercury-Redstone 3. Grissom flew MR-4.
Glenn flew Mercury-Atlas 6, Carpenter MA-7, Schirra MA-8 and Cooper
MA-9.

They named their own spacecraft: "Freedom 7", "Liberty Bell 7",
"Friendship 7", "Aurora 7", "Sigma 7", and "Faith 7". Note there was
no "Hope 7", Slayton's canceled flight would have been "Delta 7",
Shepard's second flight would have been "Freedom 7 II".

Gemini basically used roman numerals.
Gemini VI, X, etc.

Apollo had 3 that I'm aware.
Apollo 4, 6, 8, etc.
AS-201, 204, etc
SA-201, 204, etc (i.e. the same as above, but different centers put a
different emphasis on the "lead" vehicle")

And the unnumbered Apollo-Soyuz flight.

Shuttle:
STS-1, 2, etc
STS-64B

Vandenberg Shuttle flights were evidently also called STS-1V, STS-2V,
etc.

Brian