§ 5542(b) of the Military Justice Act of 2016 requires the President to “prescribe regulations implementing [the MJA] not later than one year after the date of the enactment of this Act.”
That date was December 23, 2017.
To my knowledge, President Trump has still – over two months later – not signed an executive order implementing such regulations. The Joint Service Committee published proposed regulations – in the form of a significantly updated Manual for Courts-Martial – on July 11, 2017, it accepted and considered public comments (including mine), and it held a public meeting on August 3, 2017.
But like a boot in swamp mud, the process is stuck.