The Little Joe was an unmanned rocket used to test the heat shield and launch escape system of the American Mercury capsules.
Cost efficency was the main reason for Little Joe´s existence: While the Atlas and Redstone rockets, which would later carry the Mercury Seven to space, each cost more than a million Dollars to launch Little Joe cost only 200,000 ones. This is ridiculously cheap compared to the $62 million a Falcon 9 costs today.
Overall the rocket flew eight times paving the way for the manned Mercury missions.
The model is based on the first paper model I ever built and resembles the LJ-1B version. Note that the launch escape system and the small nozzles make it hard to assemble.
The scale of the papercraft is 1:100.