Editing First lieutenant (section)

===U.S. Navy and U.S. Coast Guard===
In the [[United States Navy|U.S. Navy]] and [[United States Coast Guard|U.S. Coast Guard]], "first lieutenant" is the name of a [[billet]] and position title, rather than rank. Officers aboard early sailing ships were the captain and a number of lieutenants. The senior among those lieutenants was known as the first lieutenant, and would have assumed command if the captain were absent or incapacitated.<ref>{{cite web |url=https://www.historicnavalfiction.com/general-hnf-info/naval-facts/ranks-duties |title=Ranks & Duties |last=Hayes |first=David |website=Historic Naval Fiction |access-date=22 April 2018 |archive-date=23 April 2018 |archive-url=https://web.archive.org/web/20180423034234/https://www.historicnavalfiction.com/general-hnf-info/naval-facts/ranks-duties |url-status=live }}</ref> As modern ships have become more complex, requiring specialized knowledge of engineering, communications, and weapons, the "first lieutenant" is the officer in command of the [[deck department]] responsible for [[rope|line]] handling during [[Mooring (watercraft)|mooring]] and [[underway replenishment]]. On smaller ships, the officer of the "first lieutenant" billet holds the rank of [[lieutenant, junior grade]] or [[Ensign (rank)|ensign]]. On larger vessels, the position of "first lieutenant" is held by a lieutenant or, in the case of extremely large warships such as cruisers or [[aircraft carrier]]s, the position of "first lieutenant" may be held by a [[Lieutenant Commander (United States)|lieutenant commander]] or even [[Commander (United States)|commander]]. However, on [[submarine]]s and in aircraft squadrons, where the deck department may only have a few junior sailors, the "first lieutenant" billet may be filled by a first-class [[petty officer]] or [[chief petty officer]]. What is known in the U.S. Navy as the "first lieutenant division" is usually composed of junior sailors (E-3 and below) who are completing their ninety days of temporary assigned duty, or TAD, that all enlisted personnel are required to perform when initially assigned to a command. The primary mission of the division is servicing, cleaning, organizing and inventorying items within a command.<ref name=Barnebey>Barnebey, Matthew; "1st Lieutenant Division plays significant role in supporting base", ''Jax Air News''</ref><ref name=Cutler90>Cutler and Cutler, p.90</ref>