I have seen these before. For whatever reason, I had never read the rock. I guess I had seen but not looked. Here's the image:
In case you can't, or like me didn't, see it the caption reads:
All gave some. Some gave All.
Finding the original author (if you say Billy Ray Cyrus you get a free boot to the head) has proven difficult. There are many quotes, requotes, and reuse of this quote all over. I did see one attribution to a Korean war veteran, but nothing definite.