The Senate just completed their version of the FY2019 NDAA. It included a reduction of end strength for the National Guard and Reserve so they stay at FY2018 levels. It also allows the services to defer promotion consideration for reserve component servicemembers who are in a non-participatory, membership-only status. This gives these officers more time to come back into a participating category and get good years before meeting a promotion board.
The bill text (S. 2987) is available here.
The report (S. Rpt. 115-262) is available here.