The VA (et al) have little to no credibility because of decades of administrative misconduct, veteran neglect and downright fraud and it will take a very large hammer to fix it.
The other side of the coin, there has also been extensive abuse of the system by Veterans falsifying disablilties, both at the time of discharge physical or later in life.
The military has done an atrocious job of documenting where the troops are so the identification of exposures is near impossible.
Reading some of the VVA Veteran, the VVA's magazine, it is loaded with folks looking for others that were on a particular patrol to provide "proof they were exposed to AO. This is ridiculous.