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Produces a larger flag icon, suitable for an image in the |Ship flag= parameter of {{Infobox Ship Career}}.
{{shipboxflag|nation|variant}}|nation= – Use either the name of the nation or the three-letter ISO 3166-1 alpha-3 country code. Be sure that the country name is appropriate for the specific dates, by checking Wikipedia:WikiProject Ships/Ensigns.|variant= (optional) – Specifies the flag to use. This parameter is documented by the appropriate template in Category:Country data templates. For many countries, setting this field to naval parameter will select the naval ensign, but for civil ships, this parameter may be omitted.{{shipboxflag|United Kingdom|naval}} → 
{{shipboxflag|United Kingdom|civil}} → 
{{shipboxflag|Kingdom of Great Britain|naval}} → 
{{shipboxflag|Kingdom of Great Britain|civil}} → 
{{shipboxflag|United States}} → 
(with no variant parameter specified, the standard national flag is used, which is also the naval ensign for some countries){{shipboxflag|United States|coast guard}} → 
