March 28, 2017
On Tuesday, March 28, 2017, the President signed into law:
S. 305, the "Vietnam War Veterans Recognition Act of 2017," which encourages the display of the U.S. flag on March 29, National Vietnam War Veterans Day.
Donald J. Trump, President Donald J. Trump Signs S. 305 into Law Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/326474