From Scotusblog:
Wednesday’s argument in Babcock v Kijakazi will take the justices deep into the intersection of the Social Security Act and a host of statutes defining the obligations and compensation of National Guard workers. This will definitely not be the most closely watched case of the month — but the court’s resolution of the arcane question in the case may determine how much money certain veterans can receive in retirement benefits.
At the highest level of generality, the case involves an exception from a “windfall elimination provision” of the Social Security Act. To understand the issues before the justices, it is enough to know that Congress has adopted a statute designed to eliminate what it regards as “windfalls” that some workers would receive – unjustly large Social Security awards that would flow to workers who spent a substantial share of their working years in jobs not covered by Social Security. The exception to the windfall-elimination provision describes some payments to which that provision doesn’t apply – employees for whom Congress would tolerate what it generally would regard as a windfall. Specifically, the exception protects any “payment based wholly on service as a member of a uniformed service,” a defined term that includes among other things the Army National Guard of the United States. To put that another way, the “uniformed-services exception” at issue here allows members of uniformed services a windfall Social Security payment that is barred for members of the general public.
The question before the court is whether the benevolence of that uniformed-services exception reaches dual-status military technicians who serve in the National Guard. Those technicians provide a variety of services involving the equipment and supplies of the National Guard. Although they are paid as civilian employees, they routinely wear military uniforms and are obligated to maintain membership with an appropriate rank in the state National Guard where they are located, which carries with it (by law) membership in the Army National Guard of the United States. …