The Marines and Aussie Airmen recently made the news because of a misunderstanding in local dialect and cultural differences. The story then got blown out of proportion, as was reported by LADBible, that the Aussies were 'banned' from using their slang. Sure, on the surface, it sounds like a funny headline but when you look a bit deeper into it - the entire situation isn't as dumb as people are making it out to be.
One of the slang terms to get axed was "nah, yeah." Anyone who's ever talked to someone from the Midwest who also says it, knows that just means "yeah." Another one was "lucked out." Which isn't a problem at all if you figure out the context clues to know that it was used either literally or sarcastically.
Aussie slang isn't really all that difficult to understand. The only one that could actually cause confusion is their slang for sandals - which is 'thongs.' Having personally seen an Aussie compound while on deployment, it's a little jarring to read the signs outside their showers reading "must wear thongs before entering" and expecting everyone to be rocking a Borat man-kini.
Anyways - here are some memes.
There's an Avengers: Endgame reference in the third meme - so if you don't care about a minor throwaway joke from early in the film that has since been used in the post-release trailers...