Current (as of F23) WARG Logo can be found at: Internal Sharepoint Folder Most up to date logo (accessible to anyone logged into UW account) is here.
The logo has not been changed since: F23 (it might be nice to keep track of historical logos going forward!)
SVG file format is used because it is vector graphics and highest resolution. Any conversion results in downscaling so do the single conversion to the format you want if svg is not satisfactory.