The obscure intelligence bureau that got Vietnam, Iraq, and Ukraine right
vox.com
vox.com
In history messengers of bad news were shot. In modern times bringing bad news is a career limiting (if not, destructing) move. So the chiefs of the intel agencies will only bring palatable info to Washington.
The book is about the US intelligence community, the military / DOD / Whitehouse in coming up with an "Official" Order of Battle about the Viet Cong, and his and some of his colleagues efforts to get an honest / accurate number. Ultimately he couldn't do it internally through the CIA and resigned, there was a CBS series on it in the 1980s that led to a lawsuit.
Essentially the number of Enemy troops was set by official policy at a certain level, while the actual number was at least double this. The numbers were fudged to make it work, including removing entire categories of troops. If the real numbers came out it would make people look back, and lead the public to make some bad conclusions.
What I remember from Decent Interval, was that the US Ambassador refused to accept that South Vietnam was going to collapse. Avoiding panic aside, he took forever to get an evacuation going.
This stuff (Vietnam war) happened before I was born, but I still find it fascinating.
EDIT:
I was also thinking, as I realize that I'm getting 'old', what younger generations know about historical events. What does an average 20-something know about the Vietnam War, vs World War 2? Even the (2nd) Iraq War started over 20 years ago.
Not in a critical sense, just curious.
Maybe that's why they are always right.