I found it surprising that a large percentage of current era vets have a tbi rating because of proximity to an expolsion even if no secondary damage is present, but VN era vets in close proximity to explosions cannot get a tbi service connection. I assume explosives must be just that much more powerful now than in the 60’s.
The mk40 rocket hitting 5 ft from me with 6 lbs of high explosive I thought was pretty nasty, but no service connection for tbi for the severe tinnitis it caused.
The Vietnam boy’s with ARTY don’t have a tbi rating either. 8 inch and 175’s will do considerable hearing damage, ear plugs didn’t help.