N.J. Stat. Ann. § 38A:9-1

The State Guard may be organized, maintained and disbanded at the discretion of the Governor at any time when additional defense forces are required and such action is not prohibited by Federal and State laws and regulations. Such forces shall be composed of officers commissioned or warranted therein or assigned thereto, and such able-bodied citizens of the State as shall volunteer for service therein, supplemented, if necessary, by men of the unorganized militia enrolled by draft or otherwise as provided by law or regulation.