U.S. Army Reserve Command sits within the Department of the Army. It directs the Army Reserve, the federal reserve component of the Army, whose soldiers train on a part-time basis and can be called to full-time duty when needed.
Civilian employees work alongside uniformed members and support the Army mission. They bring skills that are not widely held within the military but that military operations rely on, and the Army combines its civilian and military staff to do its work.
Some of the jobs here are military technician positions. A military technician is a civil service employee who also serves as a member of the Army Reserve, so the role carries both civil service benefits and reserve benefits and connects the civilian workforce to Reserve units. Work in these positions is tied to keeping Reserve units ready for operations.