Some RL officers begin their careers as URL officers and transition to RL, the most common examples being Surface Warfare Officers and Submarine Warfare Officers who become Engineering Duty Officers and Naval Aviators and Naval Flight Officers who become Aeronautical Engineering Duty Officers. Still, other URL officers will transition into Staff Corps communities, most often the Medical Corps or the Judge Advocate General's Corps following completion of Navy-funded medical school or law school, while others move into other RL or Staff Corps fields. The remaining officers are directly commissioned as RL or Staff Corps. RL and Staff Corps officers are authorized to command ashore within their particular speciality, but are not eligible for combatant command at sea, which remains strictly within the purview of URL officers.