This detail in Buzzfeed's report is straight-up terrifying:
President Trump tweeted on Wednesday that transgender people cannot "serve in any capacity in the U.S. Military," repeating a claim from conservative Republicans that transgender service members disrupt the ranks and add medical costs that undermine troop readiness. The abrupt announcement seemed to stun military leaders, even though Trump said in a series of tweets that he consulted with "my generals and military experts."
...
At the Pentagon, the first of the three tweets raised fears that the president was getting ready to announce strikes on North Korea or some other military action. Many said they were left in suspense for nine minutes, the time between the first and second tweet. Only after the second tweet did military officials receive the news the president was announcing a personnel change on Twitter.
So the generals Trump claims to consult don't know from one minute to the next—from one tweet to the next—just who or what Trump is launching an attack against. Jesus.