My dad used to work on personal carriers during the Vietnam war. In 67 FMC sent him with a group of other engineer to Vietnam to figure out why the M113 wasn't

My dad used to work on personal carriers during the Vietnam war. In 67 FMC sent him with a group of other engineer to Vietnam to figure out why the M113 wasn't performing as well as advertised. Short answer when you hit a M113 with a tank rocket it turns into an oven. My dad came home and quit. Since then I've been kinda aware that a lot of engineers work is on the balance is a net negative. Especially true in the US and getting worse.