Reverse image search eventually lead me to something called the "Pineland Resistance Forces", which seems to have something to do with the Special Forces Qualification Course. Best I can tell, "Pineland" is the name of the fake country where the scenario for the training simulation is set, and the Pineland Resistance Force is the... fake guerilla team the participants are working with? The single article on the subject I kinda-sorta skimmed through wasn't entirely clear.
That said, the Pineland Resistance Force flag is argent on the bottom and says "Liberty 1870", but everything else is pretty much spot on.
tl;dr seems to be a US Army Special Forces thing.
So not only has he quite literally decimated their readerbase but he's also made every other newspaper run the story that they were going to endorse Harris anyway, instead of likely just limiting that information to the handful of Washington Post subscribers that cared enough to check. Great quash, Jeff, you really shut that one down.