Editing Sub-lieutenant (section)

== Naval rank ==
{{Globalize|section|date=November 2022}}

=== History of naval rank ===
In the British Royal Navy, a [[passed midshipman]] awaiting promotion often elected to become a master's mate, normally an experienced petty officer who assisted the [[sailing master]]. Though formally the rating did not lead to promotion to lieutenant, master's mates were paid more than any other rating and were the only ratings allowed to command any sort of vessel.<ref name="officerranks">{{cite web |url=http://www.royalnavalmuseum.org/info_sheets_nav_rankings.htm#Slt |title=Officer ranks in the Royal Navy |publisher=[[Royal Naval Museum]] |access-date=2009-04-25 |archive-url=https://web.archive.org/web/20141011015812/http://www.royalnavalmuseum.org/info_sheets_nav_rankings.htm#Slt |archive-date=11 October 2014 |url-status=live}}</ref> A midshipman who became a master's mate got an increase in pay from [[Pound (currency)|£]]1 13[[Shilling (British coin)|s]] 6[[Penny (British pre-decimal coin)|d]] to £3 16s per month, but initially reduced his chances at a commission.{{sfn|Walker|1938|p=188}}{{sfn|Lewis|1939|p=146, 197}} Over time, however, service as a master's mate became a normal part of the path to a commission. The situation caused some confusion during the last part of the 18th century, when two parallel roles—master's mates trying to become masters, and former midshipmen working toward a commission—held the same title and responsibilities aboard ship.{{sfn|Lewis|1939|p=212, 230}}

By the first years of the 19th century, the prefix "master's" was dropped for passed midshipmen, to distinguish them from master's mates in the navigator's branch.{{sfn|Walker|1938|p=188}} In 1824 two further grades were also introduced, consisting of master's assistants and second-class volunteers. These corresponded to midshipmen and first-class volunteers respectively in the executive line. From this point, passed midshipmen had the rating master's mate, abbreviated as mate, and prospective masters had the rating master's assistant. These changes helped eliminate the confusion caused by the mingling of midshipmen in the navigator's branch.{{sfn|Lewis|1939|p=212, 230}}

In 1861 the rank of mate was renamed sub-lieutenant.{{sfn|Walker|1938|p=188}}

=== Modern practice ===
In the modern Royal Navy, all [[officer cadets]] now commission as [[midshipman|midshipmen]], regardless of whether they are a graduate or a school leaver. They are subsequently promoted to sub-lieutenant one year after entering [[Britannia Royal Naval College]]. Upper yardsmen commission as sub-lieutenants assuming their seniority date is greater than 12 months.

In the Royal Canadian Navy, all undergoing basic officer training join as [[naval cadet]]s, but upon graduation, those who joined with a bachelor's degree receive an immediate promotion to acting sub-lieutenant, while those who do not retain their rank as naval cadet until such time as they finish more career-related training.

=== Use ===
In the Royal Navy, the [[Royal Australian Navy]] and the [[Royal New Zealand Navy]], the insignia of both sub-lieutenants and acting sub-lieutenants consists of one medium [[gold braid]] stripe with an [[executive curl]]. The size of this stripe should not be confused with the narrow stripe, colloquially referred to as "spaghetti strap", used on the [[Royal New Zealand Navy]] rank of [[Ensign (rank)|ensign]] and the [[Royal Canadian Navy]]'s [[Officer Cadet|naval cadets]]. The Royal Air Force also followed this example of braiding when developing their rank system (see [[flying officer]]).

The insignia of sub-lieutenants in most commonwealth countries are identical to the [[United States Navy]] and [[United States Coast Guard]] grade of ensign (although US ranks do not use the executive curl), even though its equivalent grade in the USN is actually [[lieutenant junior grade]].

In the [[Royal Canadian Navy]], acting sub-lieutenants display one medium stripe. A sub-lieutenant adds a narrow stripe ''below'' the medium stripe to maintain the executive curl on the top. The equivalent air force lieutenant rank has the narrow stripe above the medium stripe since these elements do not need to maintain spacing on top due to the lack of an executive curl; the Royal Canadian Navy followed this pattern before the addition of the curl in 2010.

=== Gallery ===
<gallery class="center">
<!-- In alphabetic order of Country please -->
File:Generic-Navy-2.svg|Acting sub-lieutenant<br />{{small|({{langx|fr|Enseigne de vaisseau de 2e classe}})}}<br />([[Royal Canadian Navy]])<ref name="Canada">{{cite web |title=Ranks and appointment |url=https://www.canada.ca/en/services/defence/caf/military-identity-system/rank-appointment-insignia.html |website=canada.ca |date=23 November 2017 |publisher=[[Government of Canada]] |access-date=28 May 2021}}</ref>
File:Generic-Navy-2.svg|Sub-lieutenant<br />([[Royal Navy]])<ref name="UK_Navy">{{cite web |title=Shaping your career |url=https://www.royalnavy.mod.uk/careers/navy-life/shaping-your-career |website=royalnavy.mod.uk |publisher=[[Royal Navy]] |access-date=24 September 2021}}</ref>
</gallery>

=== Acting sub-lieutenant ===
In 1955, the Royal Navy created the rank of [[Acting (rank)|acting]] sub-lieutenant, although it had existed intermittently in the world wars. Unlike their substantive counterparts, acting sub-lieutenants are [[subordinate officer]]s, as they hold their ranks by order and not by commission. Upon passing [[fleet board]], acting sub-lieutenants were confirmed as sub-lieutenants and issued commissions backdated to the date when they were appointed acting sub-lieutenants. The rank of acting sub-lieutenant was abolished in the Royal Navy around 1993 but remained in the [[Royal Naval Reserve]] until 2013; officers in both the RN and RNR now commission into the rank of [[midshipman]].<ref name=RNBR3Ch102>{{cite web |title=BR3, Ch102 – Maritime Reserves Personnel Management |url=http://www.royalnavy.mod.uk/~/media/royal%20navy%20responsive/documents/reference%20library/br%203/br3book/ch102.pdf |website=Royal Navy Books of Reference |publisher=[[Royal Navy]] |access-date=31 December 2015 |archive-url=https://web.archive.org/web/20160304094007/http://www.royalnavy.mod.uk/~/media/royal%20navy%20responsive/documents/reference%20library/br%203/br3book/ch102.pdf |archive-date=4 March 2016 |url-status=live}}</ref> The rank of acting sub-lieutenant remains in the Royal Navy only within the [[University Royal Naval Unit]] where training officers enter at this rank.<ref name=RNBR3Ch110>{{cite web |title=BR3, Ch 110 – The University Royal Naval Units and Cadet Forces |url=http://www.royalnavy.mod.uk/~/media/royal%20navy%20responsive/documents/reference%20library/br%203/br3book/ch110.pdf|website=Royal Navy Books of Reference |publisher=[[Royal Navy]] |access-date=31 December 2015 |archive-url=https://web.archive.org/web/20150824011951/http://www.royalnavy.mod.uk/~/media/royal%20navy%20responsive/documents/reference%20library/br%203/br3book/ch110.pdf |archive-date=24 August 2015 |url-status=live}}</ref>

Before its abolition, the rank of acting sub-lieutenant in the Royal Navy corresponded with, but was junior to, the ranks of lieutenant (Army) and flying officer (RAF).

In many Commonwealth navies (e.g. Canada and Australia), the rank of acting sub-lieutenant still exists as a commissioned rank equivalent to second lieutenant, while the rank of sub-lieutenant is equivalent to that of an army lieutenant. As the term "[[Acting (rank)|acting]]" is a designation, both acting and substantive ranks should be addressed as "sub-lieutenant"; the full designation including "acting" should be used in written documents, however. Indeed, when someone is addressed as "acting sub-lieutenant", it can be seen as a way of patronising an individual in a derogatory manner due to the emphasis of their "acting" rank.

The [[Royal New Zealand Navy]], [[Republic of Fiji Navy]] and [[South African Navy]] follows the US precedent in titling its lowest commissioned officer [[Ensign (rank)|ensign]].

In the [[Royal Thai Army]], [[Army Reserve Force Students]] who complete grade 5 and their B.D. are promoted to the rank of acting second lieutenant (ว่าที่ ร้อยตรี).