Yes I kavetched about the Army, everyone did.
Unarmored humvees? Try convoy patrol standing in the back of a M151A1 with a 60 on a stick!
Oh, and the "vest" weighed a friggin ton and we just used them as seat cushions.
The ARVN's had the M151A2's and the newer M-16's with forward assist. We had shot-out three prongers that were just 5.56 smooth bore shotguns!
"Armor" were the troop carriers, and the armor on them wouldn't resist anything more powerfull than a wrist rocket sling shot!