U.S. aircraft in Vietnam appear to have been extremely vulnerable to AAA

[NickM]

That and a little factoid I learned from reading Jack Broughton's 'Thud Ridge': 'more modern' jet aircraft had hydraulic & fuel systems placed for easy access by maintenance crews with very little thought to 'hardening' the systems--after all the attitude was 'anti aircraft fire(and dogfighting) was a thing of the past....so even minor damage could cause you to catch fire or to lose your control systems due to your 'vital fluids' draining out.