[PAR35]

The "Mercury 7" was how they referred to the whole group. Each flight had a name, also ending in 7. Liberty Bell 7 (Grissom), Freedom 7 (Shepard), Friendship 7 (Glenn). There were 6 Mercury 7 flights.

[RightOnline]

Yes, I know. I thought the poster was mistakenly referring to the mission number of the tragic fire.