When running the Topo Import>USGS Terrain command, I locate the element, but no data is imported after the "Downloading elevations..." progress bar finishes.
Due to ongoing security improvements, the USGS and SRTM data that had been hosted on third party servers are no longer available, so the USGS and SRTM import options are no longer available.
For 10.09 users, the options for USGS and SRTM remain in the menu, but the commands no longer return Terrain data.
For 10.10 users, the options for USGS and SRTM have been removed from the menus.
Esri data is still accessible through the Topo Import tool.