There's a lot of variations to the gravy recipe depending on who makes it and geographic location.
What the Navy/Marines used to have was a milk gravy (no cream or cheese) using hamburger instead of sausage, and heavily peppered over biscuits, toast, or even hash browns. The Army/Air Force did SOS (S**t On a Shingle) but that's a rather nasty compared to the Navy/Marine stuff.
There's also "red-eye" gravy involving ham and ham drippings. I've also seen a variation of this using bacon drippings.
A bit of Googling for the adventurous will turn up many different variations.