There are entire online communities around gaming the system. On how to report pre-service injuries as service related. On how to deliberately build a huge medical file while you're in to support your disability claim later. On where to go and when, in order to get your highest possible rating. Things to say and not to say. There is an entire industry of paid consultants that help you get the biggest claim possible.
It's a big issue. Over 30% of vets today have disability compared to 15% in 2008. 3% of federal revenue goes to paying veteran disability alone and it's climbing. No politician can talk about it because campaigning on taking money from disabled veterans is the best way to nuke yourself in the polls.