Just copying this from another response but:
Note: If you have a condition listed in Title 38, Code of Federal Regulation, 3.309(a), you won’t need to show the problem started during—or got worse because of—your military service. This is because we automatically assume (or “presume”) that certain conditions that appear within 1 year after discharge are caused by your service. We call these presumptive conditions.
Read Title 38, Code of Federal Regulation, 3.309(a) for a complete list of covered illnesses
I’d also note that here’s some of the suggestions google noted while I was looking for the one year diagnosis:
Like, absolutely , there is a huge obligation to veterans and too many have been screwed over the years. But can we also admit that there is definitely some room for abuse or at the very least, for the system to not function quite as intended?
I’m really lucky, there’s an independent theatre near my place. If I don’t have plans, I’ll see what’s on as I trust them to choose good stuff. Seen a lot of really awesome movies I never would’ve caught otherwise and best of all, absolutely spoiler free.
Sure, some that were not my jam at all but overall, walking into a movie and knowing next to nothing about it can be exhilarating, the story can go anywhere and you have no idea what’s up.