….links especially provided for concern trolls who attempt to misinform others.
The previous policy signed by President Obama was enacted by Congress in legislation they promulgated and passed.
https://www.nytimes.com/2017/07/26/us/politics/trans-military-trump-timeline.html?mcubz=2
And here's how it's likely Congress will put a stop to Trump's over-reach.
http://taskandpurpose.com/congress-trump-transgender-ban/