Little Joe (rocket) - Mission Numbering

Mission Numbering

The official Mercury mission numbering designation was a two letter designation which corresponded to the launch vehicle type, followed by a dash then a digit indicating the particular set of flight objectives, and an optional letter used to distinguish further flights to accomplish those objectives. So the official designation for the first Little Joe flight was "LJ-1." Flights did not occur in numeric sequence as the project scheduling was adapted as it progressed. The actual flight order was:

LJ-1
LJ-6
LJ-1A
LJ-2
LJ-1B
LJ-5
LJ-5A
LJ-5B

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