Since you have not shared the entries that describes nonjudicial punishment, here is what a non-judicial punishment is all about:
A non-judicial punishment<span> or </span>NJP<span> in the United States Armed Forces (USAF) is a form of military justice which is authorized by Article 15 of the Uniform Code of Military Justice.</span>
Answer:
In primaries, party members vote in a state election for the candidate they want to represent them in the general election. After the primaries and caucuses, each major party, Democrat and Republican, holds a national convention to select a Presidential nominee.