All the following are essential functions of political parties except to

The option that is not an essential function of political parties is "seek political power for the military". Political parties are organizations that seek to win elections and control government in order to implement their policies and ideologies. The primary functions of political parties include aggregating the interests of members of the public, serving as a link between the government and the people, and seeking political power lawfully through free and fair elections. Seeking political power for the military is not a legitimate function of political parties, as it goes against democratic principles and can lead to authoritarianism and human rights abuses.