At what rank would a service member first be designated as "Petty Officer"?

The designation of "Petty Officer" is first attained at the rank of E-4 in the United States Coast Guard and other branches of the military. This rank signifies a non-commissioned officer status, where the individual is expected to take on additional responsibilities and leadership duties as part of their role.

At the E-4 level, service members have typically undergone training and demonstrated proficiency in their designated rate, which allows them to assume more supervisory roles over junior personnel. This role is crucial within the military structure, as Petty Officers serve as both leaders and skilled practitioners of their trade.

In contrast, E-2 and E-3 ranks denote junior enlisted personnel who have not yet reached the qualifications necessary for Petty Officer status and typically perform tasks under the supervision of higher-ranking service members. E-5 and above are subsequent ranks beyond the initial Petty Officer designation, where individuals continue to advance in their careers and responsibilities.