'THE NEW AGE' FIRST PLAYTEST
Delta Green first appeared in the scenario "Convergence" in issue 7 of The Unspeakable Oath. That was 1992. The next year, author John Scott Tynes playtested the first follow-up in America Online chatrooms. This was the campaign The New Age, which would appear in the Delta Green sourcebook in 1996.
The New Age playtest ran for six months, March to September. And we kept the full transcripts: hours and hours of the oldest of old-school Delta Green gaming.