Members of the National Guard called into Federal service are, from the time when they are required to respond to the call, subject to the laws and regulations governing the Army or the Air Force, as the case may be, except those applicable only to members of the Regular Army or Regular Air Force, as the case may be.
Structure US Code
Subtitle E— Reserve Components
CHAPTER 1211— NATIONAL GUARD MEMBERS IN FEDERAL SERVICE
§ 12401. Army and Air National Guard of the United States: status
§ 12404. Army and Air National Guard of the United States: mobilization; maintenance of organization
§ 12405. National Guard in Federal service: status
§ 12406. National Guard in Federal service: call
§ 12407. National Guard in Federal service: period of service; apportionment
§ 12408. National Guard in Federal service: physical examination