మూస:USN flag
This template is used to select the appropriate ensign of the United States Navy for the Ship flag parameter of {{Infobox Ship Career}}. The template was created because the flag of the United States changed whenever a new state was admitted to the union. The template's intent is to make getting the right ensign easier.
- Usage
{{USN flag|year}}
The year parameter is optional; if absent, the current (since July 4, 1960) ensign is displayed. The image is rendered at 100x35px pixel size, which is the default standard also used by {{Shipboxflag}} for the same usage.
Also, a nitpicky usage note. The template displays the flag used at the end of the specified year. For example, the US flag changed from 46 to 48 stars on July 4, 1912. If you use {{USN flag|1912}} in an article, it will display the 48-star flag. If you want a 46-star flag for a ship that only served in early 1912, use the previous year's flag, {{USN flag|1911}}.
Also see {{navy}} for an alternate method of rendering historical United States flags, but in icon size and with a wikilink to the United States Navy article. For example, {{navy|USA|1912}} will produce 
United States Navy.