CDN call to JQuery - necessary?

I see that although the bootstrap library is made local to the project (/js/bootstrap.js and /js/bootstrap.min.js), the same is not true of the JQuery library. The sample HTML are calling the JQuery library from a CDN (https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js).

It's easy enough to call JQuery from a local location per project or per organization, but I wonder if there is a particular reason for this? This won't be acceptable for production code.

Start with the sample HTML that references https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js and compare it with the local Bootstrap files at /js/bootstrap.js and /js/bootstrap.min.js. Determine whether the project has a local jQuery location or a documented reason for the CDN, then make the dependency handling consistent or document the reason clearly.

Written by the indexing model from the issue text.