Flags, Trump and Inauguration Day

A year later, he finally made it to Iraq for the first of two deployments there. He stepped off a C-17 Globemaster III the night he arrived to see the American flag flying on the airfield.
On land, American flags are flown at half-staff ... Can proclamations be made for anyone else? The flag has been flown at half-staff upon the death of notable figures such as the Rev. Martin ...
The American flag would "for the first time ever during an Inauguration of a future President, be at half mast," said Trump. "Nobody wants to see this, and no American can be happy about it.