In the United States Navy, 310X is the designator for a Supply Corps Officer. The highest-ranking position in the Supply Corps is Commander, Naval Supply Systems Command.
College graduates can be selected for the Supply Corps Officer Candidate indoctrination and training program. This program leads to appointment on active duty as a Navy Ensign in designator 3100.
Other Navy officer designators include:
Medical Corps Officer
Judge Advocate General’s Corps Officer
Senior Health Care Executive Officer
Nurse Corps Officer
Chaplain Corps Officer
Civil Engineer Corps Officer