Project Freelancer was a research program that was created by the UNSC to find a solution to the Great War. In this research program, skilled Freelancer agents and experimental artificial intelligence were studied. In addition, the Project created simulations for their agents made with real human UNSC soldiers.
The Project was shut down (but not entirely dissolved) for many reasons, including abuse of UNSC property and moral ambiguities. When their crimes were finally revealed by the Reds and Blues, the UNSC shut the Project down for good.