https://wccftech.com/halo-reach-pc-odst-mod/

A new Halo Reach PC ODST mod has been released which allows players to play Reach’s campaign as an ODST soldier.

Initially planned to be a small side project, Halo 3: ODST was released back in 2009 for the Xbox 360. Instead of focusing on the Master Chief, ODST focuses on Orbital Drop Shock Troopers in the ruined city of New Mombasa. The shooter is set during and after the events of Halo 2 and has been an all-time favorite installment in the Halo series.