Halo 2 and Halo: Reach's internal testing of PC Forge will take place later this month.
343 announced this week that these parts of the Insider program will be able to test the following: Halo 2, Halo 2nd Anniversarywith Halo: Reached Forge and Theatre for the M aster Chief Collection PC at the end of March.
The test may also include some Halo: Arrival audio fixes, but as the fixes progress, they may or may not appear in time for the next flight.
343 pointed out that because this is an ongoing process, timing may change, but if everything goes well, Insiders will begin testing this month (thanks Neowin).
After the test ended, "Halo: History of Combat Evolution" was released in the PC version of "Halo: Master Collection" earlier this month. It is available through Steam, PC's Xbox Game Pass, and Windows 10.
If you're not playing an Xbox Game Pass subscriber, but playing a game on your PC, you can purchase the "Halo: Master Chief Collection" bundle from the Microsoft Store or Steam for $ 39.99 to add the game to your bookshelf. Currently, it also includes Halo: Reach, and will automatically update the remaining titles throughout the year when it is available.