Role
LDOs perform similar tasks as those of the warrant officer (WO), but the formal definition differences are subtle and focus on the degree of authority and level of responsibility, as well as the breadth of required expertise. The term "limited duty" refers not to an LDO's authority, but rather the LDO's career progression and restrictions. Historically an LDO, prior to World War II, could only advance as far as lieutenant (O-3E). In later years, an LDO could be promoted to commander (O-5) and, in the Marine Corps, the senior LDO rank remains lieutenant colonel (O-5). In the 1990s the ceiling in most U.S. Navy LDO communities was raised to captain (O-6).
The LDO/WO motto is "sursum ab ordine" which means "up from the ranks" to underline a distinction between them and officers commissioned directly from collegiate programs such as the U.S. Naval Academy, Naval ROTC, and similar post-collegiate pre-commissioning officer candidate programs of the Navy and Marine Corps.
Read more about this topic: Limited Duty Officer
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