Colosseum may look like a data center, but in reality, it’s a massive radio-frequency emulation testbed that DARPA built for its Spectrum Collaboration Challenge (SC2). SC2 has been a three-year competition to demonstrate the validity of using artificial intelligences to work together in order to use wireless spectrum more efficiently than operating on pre-allocated bands would be.

Source: The Forklift Ballet: How DARPA Trucked Its Massive Radio Frequency Testbed Across The United States IEEE Spectrum – IEEE Spectrum