[nemosaltat]

Since this doesn’t seem to be answered down thread- URL refers to Unrestricted Line officers, for example officers in the aviation, surface or submarine warfare communities etc. Restricted line officers can be found in the medical, supply, or intelligence communities etc. A third type of officer, and one of my personal favorite abbreviations, is the Direct Input Limited Duty Officer. DILDOs are required to have prior enlisted experience, but not required to have a bachelors degree. Restricted line officers and DILDOs could be given command of a training unit, or medical facility, but would not be given command of a ship or squadron.