The history of our stadium is so unique and the playing surface is no exception.
Grass was there from 1905 (we played at the site before the stadium was even built) through 1970.
In 1971 astroturf (back then state of the art, nowadays glorified carpet) was put in. Here's some cool pics of the installation process.
https://www.flickr.com/photos/deloye/albums/72157635208333275/page4
In 1987 the astroturf was replaced (this was the field that had "JACKETS" in white with bright gold endzones) with FieldTurf, but again basically carpet.
In 1995, grass returned, in 2002 the field was shifted very slightly. This was what I grew up on. Our grounds crew in the 00's-2010's was amazing. I remember going to my first ever GT football game at 3-4 years old and seeing that field after walking out the portal to the seats for the first time. I was a toddler, so everything looked so big. I was amazed. The grass was so nicely cut and trimmed.
Our current turf isn't bad. At least it's not the carpet crap that my dad had to deal with in his day. But I'm all for a return to grass IF it's in our budget.