According to The Daily Beast:
Many described a climate in which analysts felt they could not give a candid assessment of the situation in Iraq and Syria. Some felt it was a product of commanders protecting their career advancement by putting the best spin on the war.
Some reports crafted by the analysts that were too negative in their assessment of the war were sent back the chain of the command or not shared up the chain, several analysts said. Still others, feeling the climate around them, self-censored so their reports affirmed already-held beliefs.