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An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Alternative versions

Alternate versions of web pages should only be used when the main page can’t be made accessible. There are very few instances where they would be necessary. Live dynamic mapping applications are one example.

In a situation where an alternate version is provided, it must provide the same information and provide similar functions.