Microsoft is prepping to deploy a test version of the game on Steam, and is recruiting Earth-based UNSC operatives to help out via the Halo Insider Program. Registration is open to applicants over 18 years old, according to the FAQ, but candidates will be required to pass a basic physical combat-readiness evaluation by uploading a dxdiag report.
“Halo Insiders who choose to opt in to console or PC flighting will be considered for early access play sessions with in-development Halo games,” the Halo Insider Program blurb explains. “Every improvement to Halo: The Master Chief Collection over the past year was the direct result of Insiders participating in flights and sharing feedback to the development team. Each public flight has specific goals, meaning not all Insiders will be selected for every flight. To increase your chances for selection, make sure your Halo Insider settings are complete and accurate. And remember, you can always come back to update your settings or opt out of the program.”
Halo: Reach is the first of the Halo: The Master Chief Collection games coming to PC, preceding subsequent launches of Halo: Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, and Halo 4, but no release dates are confirmed for the moment.