Oh wait, fake bullshit.
https://www.snopes.com/sergeant-gregory-hayes/
A popular meme describes a purported act of vengeance for which we found no evidence whatsoever.
While the image was wildly popular on Facebook, not one version of it included any information substantiating its claims. We were unable to locate any news stories or public records matching the details of the rumor, nor any recent records of a retired U.S. Army sergeant named Gregory Hayes. A reverse image search didn?t turn up any results for the photograph of the purported Sgt. Hayes, either.